AT108963B
(en )
1928-02-25
Circuit arrangement for telephone systems in series connection.
AT102723B
(en )
1926-03-10
Circuit arrangement for telephone systems with intermediate amplifiers.
AT114004B
(en )
1929-08-26
Circuit arrangement for telephone systems with main and sub-exchanges.
CH153049A
(en )
1932-02-29
Circuit arrangement in telephone systems.
AT121482B
(en )
1931-02-25
Circuit arrangement for telephone systems.
CH116918A
(en )
1926-10-01
Counters for telephone systems.
DK43223C
(en )
1930-10-20
Circuit Arrangement for Use in Telephone Systems.
AT109102B
(en )
1928-03-26
Self-hooking telephone exchanges voters.
DK45983C
(en )
1932-07-25
Circuit arrangement for fully or semi-automatic Telephone Systems.
DK45974C
(en )
1932-07-25
Circuit arrangement for fully or semi-automatic Telephone Systems.
AT101565B
(en )
1925-11-10
Circuit arrangement for telephone systems with through traffic.
GR1383B
(en )
1926-12-31
AUTOMATIC TELEPHONE SYSTEMS.
AT126865B
(en )
1932-02-25
Circuit arrangement for automatic telephone systems.
DK38904C
(en )
1928-06-25
Telephone system.
DK44113C
(en )
1931-05-11
Telephone system.
GR1451B
(en )
1927-03-09
TELEPHONE SYSTEM.
DK47425C
(en )
1933-06-12
Circuit arrangement for fully or semi-automatic Telephone Systems.
DK45164C
(en )
1932-02-01
Circuit arrangement for fully or semi-automatic Telephone Systems.
DK45641C
(en )
1932-05-09
Circuit arrangement for fully or semi-automatic Telephone Systems.
DK43996C
(en )
1931-04-13
Circuit arrangement for automatic telephone systems.
DK42593C
(en )
1930-07-14
Telephone system.
DK44006C
(en )
1931-04-13
Telephone system.
DK43103C
(en )
1930-10-06
Telephone system.
DK45941C
(en )
1932-07-18
Circuit arrangement for automatic telephone systems.
ES97051A1
(en )
1926-04-16
Improvements in automatic telephone systems.