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One tantalum filament lamp. BC holder

Siemens tungsten filament lamp

Coiled filament lamp

Osram "atmostype" tungsten filament lamp

1920

Royal Ediswan metal filament lamp

"Osram-GEC" tungsten filament lamp, BC holder.

Tantalum filament incandescent lamp

"Standex" tungsten filament lamp

Tungsten filament lamp

Osram 6-7v

One tantulum filament lamp. BC holder.

Two GEC Osram tungsten filament (not coiled) 230V

210 volt 200 watt Royal Edison Tungsten filament lamp

Carbon filament Royal Ediswan lamp with cylindrical bulb

Coiled Tungsten Bi-Filament Lamp

Carbon filament electric lamp

Cryselco tungsten filament lamp

"Multiplex" multi-filament tungsten lamp

Filament lamp: large hand-made spherical lamp by G.E.C.

Six early electric filament lamps

Metallized filament lamp, 250 watts, 100 c.p.

Four early Swan bamboo filament lamps rated: (a) 65v

Tungsten filament Osram lamp by GEC Ltd.

Tungsten Bi-Filament Lamp

2 Royal "Ediswan" tungsten filament lamps GES