| 摘要 |
649,593. Holders for thermionic valves. BRITISH MECHANICAL PRODUCTIONS, Ltd. March 25, 1948, No. 8834. [Class 38 (i)] [Also in Groups V and XXXVII] In a socket holder similar to that described in Specification, 618,677, the slots 20 are made a close fit around the stems 21 of the socket elements and the retaining lugs 22 are forced through the slots, the material of the socket, polytetra.fluorethylene, being sufficiently elastic at normal temperatures to permit this. Specifications 590,069, 622,984 and 644,008 also are referred to.
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