CH22379A
(en )
1902-01-31
New to Nernst lamps with automatic heating circuit breaker in the lamp base
ES26115A1
(en )
1900-07-01
Improvements or refinements in the devices that serve as Nernst lamps with automatic switch of the heating current.
ES25363A1
(en )
1900-02-15
Improvements in electric incandescent lamps.
CH21068A
(en )
1901-05-31
Electric light bulb
ES28214A3
(en )
1901-09-16
Improvements in electric incandescent lamps.
CH24832A
(en )
1903-02-28
Light bulb socket with switch
ES24715A1
(en )
1899-10-01
Improvements in electric lamps with luminous bodies composed of second class conductors.
ES26802A1
(en )
1900-12-01
Improvements in electric and incandescent lamps.
ES24094A1
(en )
1899-05-01
Improvements introduced in electric incandescent lamps.
CH24949A
(en )
1903-03-15
Electric light bulb with two filaments that can be switched on and off alternately by turning the bulb for different candle strengths
ES22597A1
(en )
1898-06-01
Improvement in incandescent electric lamps.
ES25611A1
(en )
1900-04-01
Improvements in incandescent lamps with interior reflector.
ES26010A1
(en )
1900-06-16
Improvements introduced in the manufacture and repair of electric incandescent lamps.
CH23313A
(en )
1902-06-30
Electric light bulb
ES22117A1
(en )
1898-02-16
Improvements in incandescent electric lamps.
ES22814A1
(en )
1898-08-16
An improvement introduced in electric incandescent lamps.
CH19989A
(en )
1900-10-31
Electric light bulb
CH20820A
(en )
1901-03-31
Electric light bulb
ES24895A1
(en )
1899-11-16
Improvements in electric lamps.
ES24552A1
(en )
1899-08-16
Improvements in electric lamps.
DK3150C
(en )
1900-06-11
Lamp base for electric lamps with light body of conductors of second order.
CH28588A
(en )
1904-05-15
Innovation in incandescent light bulbs
ES26184A1
(en )
1900-08-01
Improvements in Nernst incandescent lamps.
ES25242A1
(en )
1900-01-15
Improvements in electric lamps.
ES24588A1
(en )
1899-09-01
Improvements in electric lamps.