In 1983, to realize its goal of becoming "A cultural city connected to the world", Adachi City published an English language photo magazine ADACHI with a view of establishing sister city relations. The magazine was distributed to embassies and international exchange organizations. Upon reading the magazine, the city of Belmont expressed interest in conducting international exchanges as the basis for establishing sister city relations.
On October 1, 1984, Belmont and Adachi entered a sister city relationship with the photo magazine acing as matchmaker.
In 1986, the two cities began exchanging student delegations. These students experienced each others'culture by visiting government primary and middle schools as well as home stays, thus nurturing a friendship transcending borders. In 2005, Adachi organized a citizens'exchange tour to Belmont , further expanding the scope of the relationship.
The two cities have exchanged citizen delegations in 1989, 1994, 1999 and 2004 to commemorate the 5th, 10th, 15th and 20th anniversaries of the sister city relationship, respectively.
In addition, exchanges have been conducted between boys baseball and soccer teams as well as Adachi 's boys and girls choirs. In 1992, Adachi welcomed an international relations advisor from Belmont to further strengthen ties between the two cities.
July 1993 saw the opening of 'Belmont Park', situated in Umejima, Adachi City. In the park, there is an exhibit hall where many gifts and photographs presented to Adachi from Belmont are on public view. Here, visitors can learn about Belmont and the history of sister city exchanges between Adachi.
In Belmont, there is an 'Adachi Park'adjacent to Hardy Park along the Swan River. Created in 2004, the park was designed with a Japanese theme and is ideal for picnics and walks.
| 1983.01 | English photo magazine ADACHI is published Distributed to embassies etc. in Japan |
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| 1983.03.19 | After reading ADACHI, an expression of interest in sister city relations is conveyed to Adachi by City of Belmont through Australia Japan Foundation | |
| 1983.10.11 -20 | Adachi officials visit Belmont for preparatory study | |
| 1983.11.07 | To expedite sister city relations, City of Belmont Mayor sends an invitation to Adachi City Mayor to visit Belmont |
| 1984.02.19 -22 |
Adachi City Mayor, Adachi City Assembly Chairman visit Belmont, discuss sister city relations |
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| 1984.04.10 | City of Belmont Mayor visits Adachi | |
| 1984.10.01 | Sister city agreement is signed in Adachi | |
| 1984.10.20 | Sister city agreement is signed in Belmont 30 representatives from Adachi |
| 1985.01.20 | Through its newsletter Adachi Koho, Adachi calls for citizens who wish to become pen pals with citizens from Belmont | |
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| 1985.04.27 | Adachi sends 62 letters to Belmont from citizens seeking pen pals |
| 1986.02.24 | Photographs taken by Belmont high school student presented to Adachi |
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| 1986.05 | Japan Expo held in Belmont | |
| 1986.06.16 | City of Belmont Mayor visits Adachi | |
| 1986.07.24 -08.02 |
1st Adachi student delegation 13 members | |
| 1986.09.25 -10.02 |
1st Belmont student delegation 15 members | |
| 1986.11.02 | Royal Australian Planning Institute delegation visits Adachi |
| 1987.07.28 -08.06 |
2nd Adachi student delegation 17 members |
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| 1987.10.01 -10.08 |
2nd Belmont student delegation 15 members |
| 1988.07.27 -08.05 |
3rd Adachi student delegation 19 members |
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| 1988.08.18 -08.26 |
Adachi City citizens 'delegation (68 members) visits Australia for Bicentennial celebration | |
| 1988.09.29 -10.05 |
3rd Belmont student delegation 15 members |
| 1989.07.25 -08.03 |
4th Adachi student delegation 24 members |
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| 1989.08.28 -09.04 |
Belmont citizens 'delegation (35 members) visits Adachi on 5th sister city anniversary | |
| 1989.10.04 -10.11 |
4th Belmont student delegation 13 members |
| 1990.07.25 -08.03 |
5th Adachi student delegation 27 members |
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| 1990.10.03 -10.10 |
5th Belmont student delegation 14 members |
| 1991.07.24 -08.02 |
6th Adachi student delegation 23 members |
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| 1991.09.30 -10.09 |
6th Belmont student delegation 15 members | |
| 1991.09.30 -10.09 |
With support from the Australia Japan Foundation, 7 high school students from Belmont visit Adachi on 'Green Sleeves'delegation |
| 1992.07.25 -08.05 |
7th Adachi student delegation 45 members |
   Soccer exchange |
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| 1992.08.01 | 1st international relations advisor Ms. Shelly Powell assumes post in Adachi | |
| 1992.08.19 -08.26 |
Adachi soccer delegation (24 member) visits Belmont | |
| 1992.09.28 -10.05 |
7th Belmont student delegation 11 members | |
| 1992.10.01 | City of Belmont Mayor and 2 other representatives attend Adachi City 's 60th anniversary ceremony Former Mayor Fred W. Rae recognized as Adachi special honorary citizen |
| 1993.07.04 | Belmont Park opening ceremony, with City of Belmont Mayor and 3 other representatives in attendance |
  Belmont Park opening ceremony |
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| 1993.07.28 -08.06 |
8th Adachi student delegation 45 members | |
| 1993.10.04 -10.13 |
8th Belmont student delegation 13 members |
| 1994.04.01 | 2nd international relations advisor Ms. Monica Schmidt assumes post in Adachi |
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| 1994.04.29 -05.07 |
Belmont pitchball delegation (30 members) visits Adachi | |
| 1994.07 | Adachi Week held in Belmont | |
| 1994.07.20 -07.31 |
Boys soccer delegation (26 members) visits Adachi | |
| 1994.07.27 -08.05 |
9th Adachi student delegation 45 members | |
| 1994.08 | Tokyo (formerly Fuchie) boys and girls choir visits Belmont | |
| 1994.08.24 -08.31 |
Adachi citizens 'delegation (90 members) commemorating 10th sister city anniversary | |
| 1994.10.02 -10.11 |
9th Belmont student delegation 13 members | |
| 1994.11.09 -11.16 |
Belmont citizens 'delegation (40 members) commemorating 10th sister city anniversary Former Mayor Peg Parkin is recognized as Adachi special honorary citizen |
| 1995.07.26 -08.04 |
10th Adachi student delegation 45 members |
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| 1995.10.02 -10.11 |
10th Belmont student delegation 13 members |
| 1996.03.27 -04.03 |
Adachi Boys Nankyu Baseball Federation delegation (71 members) visits Belmont |
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| 1996.04.03 | 3rd international relations advisor Ms. Maryanne Fogarty assumes post in Adachi | |
| 1996.07.24 -08.01 |
11th Adachi student delegation 46 members | |
| 1996.09.30 -10.09 |
11th Belmont student delegation 13 members |
| 1997.07.23 -08.01 |
12th Adahi student delegation 45 members |
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| 1997.09.29 -10.08 |
12th Belmont student delegation 13 members |
| 1998.04.01 | 4th international relations advisor Ms. Kristina Mills assumes post in Adachi |
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| 1998.07.22 -07.29 |
13th Adachi student delegation 46 members | |
| 1998.09.28 -10.07 |
13th Belmont student delegation 13 members |
| 1999.04.11 | City of Belmont centennial ceremony held at Belmont Primary School |
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| 1999.07.21 -07.28 |
14th Adachi student delegation 47 members | |
| 1999.08.18 -08.25 |
Adachi citizens 'delegation (89 members) commemorating 15th sister city anniversary | |
| 1999.09.27 -10.06 |
14th Belmont student delegation 13 members | |
| 1999.10.13 -10.20 |
Belmont citizens 'delegation (29 members) commemorating 15th sister city anniversary |
| 2000.04.19 | 5th international relations advisor Ms. Courtney Buller assumes post in Adachi |
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| 2000.07.26 -08.02 |
15th Adachi student delegation 46 members | |
| 2000.09.25 -10.04 |
15th Belmont student delegation 13 members |
| 2001.07.25 -08.04 |
16th Adachi student delegation 26 members |
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| 2001.10.01 -10.10 |
16th Belmont student delegation 11 members |
| 2002.04.26 | 6th international relations advisor Ms. Merilyn Major assumes post in Adachi |
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| 2002.07.31 -08.10 |
17th Adachi student delegation 26 members |
| 2003.01.08 -01.17 |
17th Belmont student delegation 13 members |
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| 2003.07.30 -08.09 |
18th Adachi middle school student delegation 27 members |
| 2004.04.03 | 7th international relations advisor Mr.Maurice Bonarrigo assumes post in Adachi |
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| 2004.07.26 -08.07 |
19th Adachi middle school delegation 27 members | |
| 2004.08.16 -08.23 |
Adachi citizens 'delegation (74 members) commemorating 20th sister city anniversary Adachi Park opening ceremony Adachi City Mayor Tsunetoshi Suzuki and Adachi Intercity Friendship Association Chairman Toshiro Matsumoto recognized as City of Belmont honorary citizens |
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| 2004.10.09 -10.13 |
Belmont citizens 'delegation (26 members) commemorating 20th sister city anniversary Mayor Peter Passeri recognized as Adachi City special honorary citizen Adachi City certificate of merit awarded to former Sister Cities Association Presidents Harry Hills and Trevor Marslen. |
| 2005.01.08 -01.15 |
18th Belmont student delegation 13 members |
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| 2005.04.18 | 8th international relations advisor Ms. Kate McKenna assumes post in Adachi | |
| 2005.08.17 -08.24 |
1st Adachi citizens 'exchange tour (27 members) visit Belmont |
| 2006.01.14 -01.23 |
19th Belmont student delegation 10 members |
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| 2006.08.16 -08.23 |
2nd Adachi citizens 'exchange tour (25 members) visit Belmont |
| 2007.01.15 -01.24 |
20th Belmont student delegation 13 members | 
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| 2007.08.15 -08.22 |
3rd Adachi citizens 'exchange tour (26 members) visit Belmont |
| 2008.01.14 -01.23 |
21st Belmont student delegation 13 members |
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| 2008.04.01 | 9th international relations advisor Mr. Nicholas Redman assumes post in Adachi | |
| 2008.08.06 -08.13 |
4th Adachi citizens 'exchange tour (30 members) visit Belmont |
| 2009.01.12 -01.19 |
22nd Belmont student delegation 10 members |
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