US PATENT SUBCLASS 439 / 618
.~.~ Having three or more circularly arranged contacts (e.g., base of vacuum tube)

Current as of: June, 1999
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439 /   HD   ELECTRICAL CONNECTORS

611  DF  WITH VITREOUS-TYPE ENVELOPE (E.G., BASE OF LAMP OR VACUUM TUBE) {5}
617  DF  .~ Plug having spaced, longitudinally engaging, prong-like contacts {1}
618.~.~ Having three or more circularly arranged contacts (e.g., base of vacuum tube)

DEFINITION

Classification: 439/618

Having three or more circularly arranged contacts (e.g.., base of vacuum tube):

(under subclass 617) Electrical connector wherein the coupling part carried by the glasslike body has at least three elongated, fingerlike contacts extending therefrom, and

wherein the fingerlike contacts are so arranged on the face of the glasslike body or the coupling part secured thereto that they will fall on the circumference of a circle.