Abstract: A plurality of spaced parallel guides are mounted on a support. The edges of printed circuit boards are mounted in these guides. The printed circuit boards are formed with the male portion of an electrical connector at one end and a locking and regulating plunger at the opposite end.The support is provided with the female portion of an electrical connector which is positioned so that when the edges of the printed circuit board are mounted in the guides, the male part of the connector is aligned with the female connector whereby the male connector can penetrate the female connector. The plunger both locks the printed circuit board on the rack and regulates the depth of penetration of the male connector into the female connector.

Abstract: This invention relates to a pressure transducer and more particularly to a pressure transducer having means by which the pressure transducer can be removed from a pressurized line without loss of line pressure. The pressure transducer is mounted in a housing, which is adapted to be releasably mounted on a bracket. The bracket is provided with a tubular needle valve coupling which is adapted to be connected to a pressurized line. The coupling normally keeps the pressurized line closed, but when the housing of the pressure transducer is mounted on the bracket, the needle valve in the coupling is automatically actuated, opening the pressure transducer to the pressure in the line.