(under subclass 50.52) Subject matter where the envelope has a portion thereof formed so as to be at least a part of an electrical connector.
(1) Note. The portion of the envelope which forms the part of the electrical connector may be a metallic wall portion which is used to complete the wall portion of a glass or ceramic envelope.
(2) Note. Devices where the lead-in wires only are formed or are of sufficient rigidity to form contacts are in subclass 50.52 and not in this subclass. This subclass includes devices having a wall portion sealed with a metallic closure which is designed for use as an electrical connector.
(3) Note. Included in this subclass are envelopes of metals, glass or other ceramic which have a portion formed with screw threads so as to form a part of a screw threaded base type connector. The threads may or may not be covered
