首页>
外国专利>
RING FOR SUPPORTING THE SPIRAL FILAMENT OF GAS-FILLED INCANDESCENT LAMP WITH TUBE-LIKE ENVELOPE FLATTENED ON BOTH ENDS AND METHOD FOR MAKING THE SAID RING AND FOR PUTTING THE SAID RING INTO THE ENVELOPE
RING FOR SUPPORTING THE SPIRAL FILAMENT OF GAS-FILLED INCANDESCENT LAMP WITH TUBE-LIKE ENVELOPE FLATTENED ON BOTH ENDS AND METHOD FOR MAKING THE SAID RING AND FOR PUTTING THE SAID RING INTO THE ENVELOPE
