Electric incandescent lamp having a metal cap welded to a...
Electric incandescent lamp having a pinched base
Electric incandescent lamp having a tungsten-bromine cycle
Electric incandescent lamp of the infra-red type having...
Electric incandescent lamp with ellipsoid-shaped envelope
Electric incandescent lamps
Electric incandescent lamps
Electric incandescent lamps
Electric incandescent lamps
Electric incandesdent lamp having a tungsten-bromine cycle
Electric lamp
Electric lamp
Electric lamp
Electric lamp
Electric lamp
Electric lamp
Electric lamp
Electric lamp
Electric lamp and an illuminating system having such an...
Electric lamp apparatus having diffusion barrier