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Ernest Boehm
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Publication of GB190903897ApublicationCriticalpatent/GB190903897A/en
3897. B ÷ h m, E. Feb. 17. B u l b s. - T h e inner end A of a bulb is of dense opal, the middle is clear, and the outer end C is of semitransparent o p a 1, which may be coloured.
GB190903897D1909-02-171909-02-17Improvements in Incandescent Electric Lamps.
ExpiredGB190903897A
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