FR692232A
(en )
1930-10-31
Negative incandescent lamp
SU17163A1
(en )
1930-09-30
Kerosene hot lamp
ES111048A1
(en )
1929-03-01
A new incandescent lamp for electric lighting.
DK43934C
(en )
1931-03-30
Device for lighting discharge pipes (fluorescent lamps).
DK47859C
(en )
1933-10-09
Electric lighting device with a discharge tube acting as a fluorescent lamp.
ES108849A1
(en )
1928-09-16
Improvements in incandescent lamps for the illumination of optical devices.
ES112377A1
(en )
1929-07-16
An electric incandescent lamp.
DK43321C
(en )
1930-11-10
Device for Assembly of Lighting Luminaires.
DK44518C
(en )
1931-08-24
Lighting system with an electric fluorescent lamp with Column discharge.
DK45783C
(en )
1932-06-13
Lighting fixture for electric lamps.
DK41820C
(en )
1930-03-10
Reflector device for Incandescent lamps.
SU23289A1
(en )
1931-09-30
Reflector, covered with light
FR676337A
(en )
1930-02-21
Incandescent electric lamps
ES112368A1
(en )
1929-07-01
An electric incandescent lamp.
ES114273A1
(en )
1929-10-01
An electric incandescent lamp.
ES113108A1
(en )
1929-09-01
An electric incandescent lamp.
DK43880C
(en )
1931-03-23
Fluorescent lamps containing a mixture of neon and mercury vapor.
ES110659A1
(en )
1929-02-01
An amplifier of the luminous power of the incandescent lamps for electric lighting based on lenses.
ES111193A1
(en )
1929-04-01
An electric incandescent lamp or similar device.
DK41426C
(en )
1930-01-06
Screw-shaped light fixture for electric filament lamps and Procedure for its manufacture.
ES101074A1
(en )
1927-03-01
Reflector device for incandescent lamps.
FI12359A
(en )
1929-03-01
Electric light bulb
ES113683A3
(en )
1929-08-01
Improvements in incandescent lamps for optical devices.
ES107166A1
(en )
1928-06-16
Incandescent electric lamp.
DK46097C
(en )
1932-08-22
Electric Discharge Lamp.