Abstract: A pyrotechnic shock testing machine employs flexure plates attached to an anvil lying in a vertical plane of a supporting frame to apply pyrotechnic shock pulses to a test unit attached to the anvil when a hammer is dropped to strike the anvil. The dimensions of the flexure plates can be selected to control the lower frequencies of the shock pulse. The anvil materials and their coupling can be selected to control the higher frequencies of the shock pulse whereby shock pulses in the range of 100 to 10000 hertz and accelerations in the range of 50 to 10000 g's can be applied to a test unit in the x, y and z directions. The shock testing apparatus is compact and portable and without the need to have complex hammer raising and dropping mechanisms.

Abstract: A high density integrated circuitry package is disclosed where gates containing the circuit cards are rotatably mounted in the cabinet with some of the gates fixed to a central core and other gates pivoted to the core. The pivoted gates are extendable outside of the cabinet for diagnostic and maintenance purposes and for simultaneously providing access to the fixed gates.