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James Freel
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Individual
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Individual
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Publication of GB190814805ApublicationCriticalpatent/GB190814805A/en
14,805. Freel, J. July 13. Speaking-tubes.-An antiseptically treated diaphragm 4 of silk or the like is stretched across the mouthpiece and is held in position by an annular ring. The ring has a U-shaped cross-section, one branch being thicker than the other. The thicker branch 5 fits over the rim of the mouthpiece, and the thinner branch presses against the antiseptic diaphragm.
GB190814805D1908-07-131908-07-13Antiseptic Attachment for Telephone Mouthpieces
ExpiredGB190814805A
(en)