CH89137A
(en )
1921-05-02
Procedure for protecting electrical systems against overvoltages.
FR510907A
(en )
1920-12-14
Protection device for electrical pipes
DK26966C
(en )
1920-11-29
Sleeve or funnel-like lead-through means for protecting wires.
CH168547A
(en )
1934-04-15
Device for protecting electrical installations against insulation faults.
CH86471A
(en )
1920-09-01
Device for protecting networks provided with earthing reactors against resonance voltages.
CH98906A
(en )
1923-04-16
Electrical surge protection.
CH79255A
(en )
1918-10-16
Protection device against overvoltages in electrical systems
ES79671A1
(en )
1922-01-16
Protection against overvoltages in high voltage installations.
CH97738A
(en )
1923-02-01
Device for the protection of subdivided line networks.
DK31468C
(en )
1923-03-26
Electrical Temperature Protection.
CH96381A
(en )
1922-10-02
Protective equipment for electrical systems using earth fault coils and damping resistors.
FR534414A
(en )
1922-03-25
Device for protecting electrical networks against overvoltages
AT91065B
(en )
1923-01-25
High voltage clamp.
FR584405A
(en )
1925-02-06
Device for protecting electrical installations against surges
FR520624A
(en )
1921-06-28
Surge arrester
GB176170A
(en )
1922-03-09
Electrical apparatus for protection against burglary and the like
FR529028A
(en )
1921-11-22
Spark plugs
FR548350A
(en )
1923-01-12
Electrical surge protection device
FR562990A
(en )
1923-11-23
Device for protecting electrical networks against overvoltages
DK31097C
(en )
1923-01-08
Automatic electrical switch for overvoltage protection devices.
CA198116A
(en )
1920-03-09
Electrical protective device
ES87530A1
(en )
1924-01-01
Protection device for electrical installations.
DK28780C
(en )
1921-11-14
Spark arrestor.
DK31460C
(en )
1923-03-26
Device for systems for protection of electrical systems against overcurrent.
FR542707A
(en )
1922-08-21
Jointing device for round bars or cables