FR592127A
(en )
1925-07-28
Improvement in electrical switches
AT105627B
(en )
1927-02-25
Device for converting single-phase current into direct current.
FR631797A
(en )
1927-12-26
Improvement in electrical insulation
AT155592B
(en )
1939-02-25
Device for converting direct current into periodically variable current.
CH139030A
(en )
1930-03-31
Device for converting light into current or voltage changes.
ES96772A1
(en )
1926-04-01
Improvements in current rectifier devices.
ES97271A1
(en )
1926-05-01
Improvements in current rectifying devices.
ES99625A1
(en )
1927-01-01
Improvements in current transformers.
ES101103A1
(en )
1927-03-01
Improvements in electrical transformers.
DK39681C
(en )
1929-01-02
Electric Rectifier.
ES100533A1
(en )
1927-02-01
Improvements in electrical conductors.
DK39925C
(en )
1929-03-18
Device for Providing Symmetry in Radiogoniometers.
ES93356A1
(en )
1925-06-16
Improvements in current rectifier devices.
ES91092A1
(en )
1924-12-01
Improvements in electric capacitors.
ES98205A1
(en )
1926-08-01
Improvements in electric ovens.
ES92772A1
(en )
1925-06-01
Improvements in electrical connections.
GR1084B
(en )
1925-12-29
IMPROVEMENTS IN ELECTRICAL CONNECTIONS.
ES93131A1
(en )
1925-06-16
Improvements in electrical switches.
DK37422C
(en )
1927-05-02
AC inverter.
ES99803A1
(en )
1926-12-01
Improvements in electric current refrigerating devices.
ES89669A1
(en )
1924-09-01
Improvements in radio-receivers.
DK36641C
(en )
1926-10-04
Telegraph device with AC power along wires.
CH138417A
(en )
1930-02-28
Device for regulating AC power lines.
AT106723B
(en )
1927-06-25
Device for removing intermediate voltages in collector batteries.
ES100665A1
(en )
1927-03-01
Three-phase transformer.