DK44131C
(en )
1931-05-18
Circuit device for counting connections of different tariff classes in telephone systems.
FR38340E
(en )
1931-05-12
Telephone circuit combination system
AT102649B
(en )
1926-02-25
Circuit arrangement for counting connections of different values in telephone systems.
DK40377C
(en )
1929-07-01
Device for Reducing Noise in Telephone Circuits.
AT131949B
(en )
1933-02-25
Circuit arrangement for time counting connections of different values in telephone installations.
DK45359C
(en )
1932-03-07
Circuit Device for Automatic Telephone Systems.
DK46657C
(en )
1932-12-19
Circuit device for automatic Telephone Systems.
CH153049A
(en )
1932-02-29
Circuit arrangement in telephone systems.
DK43223C
(en )
1930-10-20
Circuit Arrangement for Use in Telephone Systems.
DK45907C
(en )
1932-07-11
Circuit arrangement for fully and semi-automatic Telephone Systems.
DK45217C
(en )
1932-02-08
Circuit arrangement for an automatic telephone system.
DK45842C
(en )
1932-06-27
Telephone system counting device.
DK41459C
(en )
1930-01-13
Connection device for Counting Connections of different Valence at Telephone systems.
DK36451C
(en )
1926-08-30
Device for Telephone Call Counting Devices.
AT108963B
(en )
1928-02-25
Circuit arrangement for telephone systems in series connection.
DK45941C
(en )
1932-07-18
Circuit arrangement for automatic telephone systems.
DK45839C
(en )
1932-06-20
Circuit device for a Telephone system.
DK41025C
(en )
1929-11-04
Telephone system counting device.
ES96059A1
(en )
1926-04-16
Improvements in automated telephone systems.
ES99048A1
(en )
1926-11-01
Improvements in automatic telephone systems.
DK44558C
(en )
1931-09-07
Circuit device for automatic telephone systems.
ES89606A1
(en )
1924-08-16
Improvements in telephone systems.
ES91218A3
(en )
1924-12-01
Improvements in telephone systems.
ES94764A3
(en )
1925-11-16
Improvements in automated telephone systems.
CH153048A
(en )
1932-02-29
Circuit arrangement in telephone systems.