GR2348B
(en )
1929-06-25
IMPROVEMENTS IN AUTOMATIC AND SEMI-AUTOMATIC TELEPHONE SYSTEMS.
ES115509A1
(en )
1929-12-01
Improvements in automatic and semiautomatic telephone systems.
GR2347B
(en )
1929-06-24
IMPROVEMENTS IN AUTOMATIC OR SEMI-AUTOMATIC TELEPHONE SYSTEMS.
ES97051A1
(en )
1926-04-16
Improvements in automatic telephone systems.
ES94412A1
(en )
1925-11-01
Improvements in automatic telephone systems.
ES93788A1
(en )
1925-07-16
Improvements in automatic telephone systems in general.
ES112398A1
(en )
1929-10-01
Improvements in automatic or semiautomatic telephone systems.
ES99395A1
(en )
1926-11-16
Improvements in automatic or semi-automatic telephone systems.
AT126867B
(en )
1932-02-25
Automatic telephone system.
CH153049A
(en )
1932-02-29
Circuit arrangement in telephone systems.
GR1378B
(en )
1926-12-31
IMPROVEMENTS IN SEMI-AUTOMATIC TELEPHONE SYSTEMS.
DK46755C
(en )
1933-01-09
Fully or semi-automatic Telephone System.
ES107484A1
(en )
1928-07-01
Improvements in automatic and semiautomatic telephone systems.
ES93024A1
(en )
1925-06-16
Improvements in automatic telephone systems.
ES112519A1
(en )
1929-07-01
Improvements in photographic equipment.
ES112528A1
(en )
1929-07-01
Improvements in photographic equipment.
ES114095A1
(en )
1929-08-16
Improvements in photographic equipment.
ES111990A1
(en )
1929-06-16
Improvements in automatic and semi-automatic scales.
ES117322A1
(en )
1930-05-01
Improvements in telephone devices.
ES92192A1
(en )
1925-04-16
Improvements in automatic or semi-automatic telephone systems.
ES93021A1
(en )
1925-06-16
Improvements in automatic or semi-automatic telephone systems.
ES107118A1
(en )
1928-06-16
Improvements in automatic phonographs.
ES113113A3
(en )
1929-07-16
Improvement in filters.
ES99048A1
(en )
1926-11-01
Improvements in automatic telephone systems.
DK45907C
(en )
1932-07-11
Circuit arrangement for fully and semi-automatic Telephone Systems.