According to the report in 2008 by OHSAWA Hideo (大沢秀雄), a professor of the Department of Health, Tsukuba University of Technology, postal envelopes produced by the students at the Rakuzenkai Institution for the Blind and Mute in Tokyo were found.
The production of postal envelopes was to reduce school expenses in the early days of the Institution as well as part of vocational training. A stamp to show who produced is seen on the evelope
Hisoka (前島密: 1835~1919), the chief of the Japanese post office
(Ekiteiryo), recommended the sale of these products. Maejima worked on
the establishment as a member of a philanthropic society called the
Rakuzenkai Society. Furthermore, he acted as a negotiator for the Tokyo
Blind and Deaf School, contributing to the development of education for
the blind and deaf.
On Maejima's recommendation, the envelops were produced by blind
students from May, 18, 1800, and later deaf students from September 1
in the same year with the use of the instrument created by Ochi Seiren (), the
first director of the institution.