GR1677B
(en )
1927-12-02
PERFECTIONS IN AUTOMATIC TELEPHONE SYSTEMS.
GR1621B
(en )
1927-09-30
PERFECTIONS IN AUTOMATIC TELEPHONE SYSTEMS.
GR1312B
(en )
1926-12-16
PERFECTIONS IN AUTOMATIC PHONE SYSTEMS.
GR1377B
(en )
1926-12-31
PERFECTIONS IN AUTOMATIC MUTOR FOR TELEPHONE SYSTEMS.
GR1717B
(en )
1928-01-17
PERFECTIONS IN SEMI-AUTOMATIC TELEPHONE SYSTEMS.
GR1261B
(en )
1926-08-09
PERFECTIONS IN SEMATOGRAPHY SYSTEMS.
GR942B
(en )
1925-06-13
PERFECTIONS IN SEMATOLOGY SYSTEMS.
GR1866B
(en )
1928-06-08
PERFECTIONS IN AUTO TELEPHONY SYSTEMS.
ES94412A1
(en )
1925-11-01
Improvements in automatic telephone systems.
ES93788A1
(en )
1925-07-16
Improvements in automatic telephone systems in general.
ES97051A1
(en )
1926-04-16
Improvements in automatic telephone systems.
ES94764A3
(en )
1925-11-16
Improvements in automated telephone systems.
GR2251B
(en )
1929-04-08
PERFECTIONS IN TELEPHONE CALL COUNTING SYSTEMS.
GR1448B
(en )
1927-10-20
AUTOMATIC TELEPHONE SYSTEM.
GR1611B
(en )
1927-09-26
AUTOMATIC TELEPHONE SYSTEM.
GR1700B
(en )
1928-01-02
AUTOMATIC TELEPHONE SYSTEM.
ES104356A1
(en )
1927-12-01
Automatic sub-station.
ES96059A1
(en )
1926-04-16
Improvements in automated telephone systems.
AT112312B
(en )
1929-02-25
Self-collecting telephone station.
ES93024A1
(en )
1925-06-16
Improvements in automatic telephone systems.
GR1340B
(en )
1926-12-15
PERFECTIONS IN EXPANSION SYSTEMS.
GR1386B
(en )
1927-01-04
PERFECTIONS IN EXPANSION SYSTEMS.
GR1750B
(en )
1928-02-15
PERFECTIONS IN OR RELATED TO TELEPHONE SYSTEMS.
GR3206B
(en )
1931-05-22
PERFECTIONS IN RADIOSIGNALIZATION SYSTEMS.
GR1383B
(en )
1926-12-31
AUTOMATIC TELEPHONE SYSTEMS.