DK46048C
(en )
1932-08-15
Circuit arrangement for fully or semi-automatic Telephone exchanges.
DK43359C
(en )
1930-11-17
Semi-automatic Telephone System.
DK44998C
(en )
1931-12-14
Circuit arrangement for a fully or semi-automatic Telephone System.
DK43013C
(en )
1930-09-22
Automatic Phone Dialer.
DK42697C
(en )
1930-08-04
Circuit arrangement for a telephone system.
DK42942C
(en )
1930-09-08
Circuit arrangement for a telephone system.
DK45974C
(en )
1932-07-25
Circuit arrangement for fully or semi-automatic Telephone Systems.
DK45983C
(en )
1932-07-25
Circuit arrangement for fully or semi-automatic Telephone Systems.
AT104322B
(en )
1926-10-11
Telephone.
ES93021A1
(en )
1925-06-16
Improvements in automatic or semi-automatic telephone systems.
ES92192A1
(en )
1925-04-16
Improvements in automatic or semi-automatic telephone systems.
AT113265B
(en )
1929-05-25
Circuit arrangement for fully automatic telephone exchanges.
DK43996C
(en )
1931-04-13
Circuit arrangement for automatic telephone systems.
DK45439C
(en )
1932-03-21
Circuit arrangement for fully or semi-automatic Telephone systems.
DK45090C
(en )
1932-01-11
Circuit arrangement for fully or semi-automatic Telephone Systems.
DK35614C
(en )
1926-02-15
Automatic Dialer for Telephone exchanges.
DK46766C
(en )
1933-01-16
Circuit arrangement for fully or semi-automatic Telephone Systems.
DK46162C
(en )
1932-09-05
Circuit arrangement for fully or semi-automatic Telephone Systems.
DK45091C
(en )
1932-01-11
Circuit arrangement for fully or semi-automatic Telephone Systems.
DK42593C
(en )
1930-07-14
Telephone system.
DK43103C
(en )
1930-10-06
Telephone system.
DK44006C
(en )
1931-04-13
Telephone system.
CH113258A
(en )
1926-04-16
Telephone receiver.
DK44200C
(en )
1931-06-08
Telephone exchange system.
DK45164C
(en )
1932-02-01
Circuit arrangement for fully or semi-automatic Telephone Systems.