ES50997A1 -
An industrial product consisting of very small diameter tungsten wire for use in electric incandescent lamps obtained by the procedure described.
- Google Patents
An industrial product consisting of very small diameter tungsten wire for use in electric incandescent lamps obtained by the procedure described.
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ES50997A1911-07-221911-07-22
An industrial product consisting of very small diameter tungsten wire for use in electric incandescent lamps obtained by the procedure described.
ExpiredES50997A1
(en)