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F21H—INCANDESCENT MANTLES; OTHER INCANDESCENT BODIES HEATED BY COMBUSTION
F21H3/00—Manufacturing incandescent mantles; Treatment prior to use, e.g. burning-off; Machines for manufacturing
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FR443894D1912-05-081912-05-08Procédé de fabrication des manchons pour becs renversés destinés à l'éclairage à incandescence par le gaz
ExpiredFR443894A
(fr)