1932
Mix&Genest
Germany, 1910
Bell
USA, 1875
Switzerland, 1895
Grammont
France, 1921
Hasler
Switzerland, 1905
Societe Industrielle des Telephones
France, 1926
Switzerland, 1900
KJOBENHAVNS TELEFONE AKTIESELSKAB
Denmark, 1892
J.E. Braud
RTT
Switzerland, 1955
1910
A. Zellweger
Europe, 1887
Emil Mollers – Horsens
Denmark, 1900
Jacqueson
France, 1910
Switzerland, 1896
1890
Association des ouvriers en instruments de precision
France, 1927
RТТ
Switzerland, 1925
Gautier&Hugues
Dunyach&Leclert
France, 1924
France, 1900
Thomson-Houston
S.H. Couch Company
USA, 1910
1903
Ericsson
Sweden, 1930
Western Electric
USA, 1877
Panasonic
Japan, 1980
Sweden, 1895
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