Abstract: A substrate which serves as an element for building an electronic module for ordnance applications comprising a body portion, for receiving electronic components, and a plurality of tab means extending therefrom for interlocking with complementary tab means on another similar substrate. The tab means may extend from the top, bottom, and/or sides of the substrate, and serve to mechanically and electrically interconnect with complementary tab means or apertures on adjacent substrates to form an electronic module of high mechanical strength and reliability. Such an electronic module may be assembled from at least three substrates. Each substrate has at least two tab means on each side edge thereof.

Abstract: A verification technique which greatly simplifies and facilitates the tesg of the wiring of wrapped wire electronic boards. The technique contemplates continuity testing of each branch and discontinuity testing between successive branches. After a continuity test for one branch and a discontinuity test with the next succeeding branch, the two branches are then short-circuited. The procedure is repeated with each wired branch until all branches have been tested, whereupon the short-circuit wire may then be removed. The testing technique may be facilitated by utilizing a numerically controlled terminal locator in combination with a computer generated control tape. The technique also contemplates a visual check to verify that all pins on the board that are intended to be wired are indeed wired, and that all pins on the board which are not intended to be wired are indeed bare.