CH76268A
(en )
1918-04-16
Circuit arrangement for signaling or telephone systems for individual calls from stations connected to a double line
CH77312A
(en )
1918-04-01
Circuit arrangement for telephone systems with central battery for automatic, optional calls to individual from several connected stations
AT73116B
(en )
1917-02-26
Circuit arrangement for individual calls from stations connected to a double line.
CH66404A
(en )
1914-09-01
Circuit arrangement for signaling or telephone systems for the selective calling of individual of several stations lying in one line
AT89489B
(en )
1922-09-25
Circuit arrangement for intermediate switch in telephone systems.
GB118133A
(en )
1918-08-13
Machine Switching Telephone Systems.
CH58100A
(en )
1913-02-17
Device for telephone systems for selective calling from locations connected to a common line
AT89309B
(en )
1922-09-11
Telephone switching system.
AT80136B
(en )
1920-02-25
Circuit arrangement for telephone systems. Circuit arrangement for telephone systems.
AT89732B
(en )
1922-10-25
Telephone switching system.
AT89517B
(en )
1922-09-25
Circuit arrangement for voters in telephone systems with company lines.
AT88412B
(en )
1922-05-10
Device for signaling.
AT75656B
(en )
1919-02-25
Circuit arrangement for a single run of stations connected to a double line.
AT98628B
(en )
1924-11-25
Circuit arrangement for telephone systems with dialer operation.
CH77693A
(en )
1918-10-01
Trough-like terminal plate for low-voltage lines
GB118644A
(en )
1918-09-12
Machine Switching Telephone System.
AT89514B
(en )
1922-09-25
Circuit arrangement for telephone systems with dialer operation and central supply of the subscriber microphones from the office.
AT99338B
(en )
1925-02-25
Telephone system for optional calls.
DK35237C
(en )
1925-11-09
Telephone system.
AT89487B
(en )
1922-09-25
Self-dialing telephone system for company line connections.
CH80754A
(en )
1919-04-01
Self-collecting telephone station
DK27604C
(en )
1921-05-17
Telephone exchange system.
DK34928C
(en )
1925-08-31
Telephone exchange system.
GB121247A
(en )
1918-12-12
Machine Switching Telephone Exchange Systems.
AT102723B
(en )
1926-03-10
Circuit arrangement for telephone systems with intermediate amplifiers.