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Curt Bartenstein
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Non-Portable Lighting Devices Or Systems Thereof
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Abstract
8497. Bartenstein, C. April 22. Incandescent lamps.-Bulbs are moulded with circular corrugations a, in planes at right-angles to the length of the filaments, and of any desired form in section, to diffuse the light.
GB189908497D1899-04-221899-04-22Improvements in Bulbs for Electric Incandescence Lamps.
ExpiredGB189908497A
(en)