AT96089B
(en )
1924-02-25
Contact bank for voters in telephone systems.
AT89510B
(en )
1922-09-25
Terminal bank for voters.
ES85296A3
(en )
1923-07-01
Improvements in telephone systems.
ES85297A3
(en )
1923-07-01
Improvements in telephone systems.
AT102723B
(en )
1926-03-10
Circuit arrangement for telephone systems with intermediate amplifiers.
AT98628B
(en )
1924-11-25
Circuit arrangement for telephone systems with dialer operation.
CH107492A
(en )
1924-11-01
Number switch for telephone systems with dialer operation.
AT91093B
(en )
1923-01-25
Circuit arrangement for secret line selectors.
AT89517B
(en )
1922-09-25
Circuit arrangement for voters in telephone systems with company lines.
AT95831B
(en )
1924-01-25
Counter arrangement for telephone purposes.
ES85630A1
(en )
1923-07-01
Improvements in telephone systems.
ES87640A1
(en )
1924-02-01
Improvements in telephone systems.
AT108963B
(en )
1928-02-25
Circuit arrangement for telephone systems in series connection.
ES76926A1
(en )
1921-04-01
Improvements in telephones.
ES76927A1
(en )
1921-04-01
Improvements in telephones.
ES79730A1
(en )
1922-02-01
Improvements in telephones.
DK44344C
(en )
1931-07-13
Switching device for use in telephone systems.
AT99338B
(en )
1925-02-25
Telephone system for optional calls.
AT140129B
(en )
1935-01-10
Circuit arrangement for voters in telephone systems.
AT94097B
(en )
1923-08-25
Telephone dialer.
AT87530B
(en )
1922-03-10
Spark arrestor, in particular for locomotives.
DK35807C
(en )
1926-03-29
Telephone system.
DK33647C
(en )
1924-09-08
Telephone system.
DK34694C
(en )
1925-07-06
Telephone system.
AT115431B
(en )
1929-12-27
Circuit arrangement for telephone systems with intermediate amplifiers.