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Expired
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GB1671219A
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Individual
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Individual
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Priority to GB1671219ApriorityCriticalpatent/GB174093A/en
Publication of GB174093ApublicationCriticalpatent/GB174093A/en
174,093. Furnival, J. M. Oct 20, 1920. Pivoting-adjustments. - The sensitiveness of microphones is controlled by a pad b mounted on a spring c carried by an arm d moving stiffly about a pivot e, the pad bearing on a second diaphragm a. The pressure of the spring can be adjusted by the screw f.
GB1671219A1920-10-201920-10-20Improvements in microphones or telephone transmitters
ExpiredGB174093A
(en)