CH76990A
(en )
1918-03-01
Automatic power switch-off and switch-on device for electric water heaters
CH76989A
(en )
1918-03-01
Automatic power switch-off and switch-on device for electric water heaters
CH76897A
(en )
1918-07-16
Electric hot water central heating
CH75532A
(en )
1917-08-16
Electric heater
FR542594A
(en )
1922-08-17
Electric automatic switch-on mechanism
CH81714A
(en )
1919-07-01
Electric internal pipe heating
CH77493A
(en )
1918-09-16
Electric internal pipe heating
FR484682A
(en )
1917-10-30
Electric water heater
CH75109A
(en )
1917-10-01
Electric torch with plate-shaped elements
CH75224A
(en )
1917-11-16
Electric cooking device with heat storage device
CH76899A
(en )
1918-02-16
Electric heating element
CH77889A
(en )
1918-09-16
Temperature regulating device for an electrical heating device with an electrically operated on and off switch for heating current
CH75952A
(en )
1917-10-16
Electric cooking and heating plate
CH78396A
(en )
1918-07-16
Electric heater
DK22155C
(en )
1917-05-21
Automatic Switch and Power Shutter for Electric Lighting Systems.
CH76261A
(en )
1917-11-16
Electric hand lamp
CH76863A
(en )
1918-03-01
Electric power plant with regeneration
AT87449B
(en )
1922-02-25
Protective device for electric power generators.
FR486370A
(en )
1918-03-28
Electric heater
CH77337A
(en )
1918-04-01
Electric heating and lighting apparatus
FR571228A
(en )
1924-05-14
Electric current thermal switch
ES64027A1
(en )
1917-04-01
Improvements in electric water heaters.
CH80656A
(en )
1919-08-16
Electric tube heating device in boilers
FR512746A
(en )
1921-01-29
Advanced electrical switch
CH80070A
(en )
1919-02-01
Electric heating tile