Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB738524A
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Individual
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Individual
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Priority to GB738524ApriorityCriticalpatent/GB232022A/en
Publication of GB232022ApublicationCriticalpatent/GB232022A/en
232,022. Miller, G. A. March 24, 1924. Vacuum tubes.-A device for protecting thermionic valves comprises a cylindrical base d which is secured to the valve panel a, and a cover c which fits on to the base portion d and covers the valve. The cover is lined with felt h and is provided with inspection openings.