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Joseph Hudson
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Individual
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Individual
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Publication of GB190724900ApublicationCriticalpatent/GB190724900A/en
24,900. Hudson, J., [trading as Hudson & Co., J.]. Nov. 11. Sirens.-A siren signalling-device comprises a trumpet a to which is secured, detachably or permanently, a part b carrying fixed and rotary disks b<1>, e<1> respectively, which are bored with inclined boles. The part b may be screwed into an extension a<1> of the horn a, and may be used independently.
GB190724900D1907-11-111907-11-11Improvements in Sirens and like Sounding Appliances
ExpiredGB190724900A
(en)