IBM Electric Punched Card Accounting Machines -- Customer Engineering Manual -- Test Control Panel, accounting machine Type 402.
IBM NY 1951, 27 pages, double-column text, illustrations and diagrams throughout.
Condition: Good+ to very good overall, stapled binding, 3-hole punched at margin, white heavy paper covers, smudging and light wear (covers a bit dirtied, prev. owner's name lightly and fading in ink at top front) but sound and secure.
1950's computers and computing,
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The 402 Test Control Panel is designed to give the maximum machine test including the 923 Carriage with a minimum of cards. The control panel may also be used to test the same operations on the Type 403 Accounting Machine. ... Simplicity of wiring has been utilized to assist the customer engineer by maintaining vertical alignment of the control panel hubs where possible. Also included in the test is a listing describing the control panel wiring and showing the counter and carriage controls (figure 1 pages 4,5)... from the first page of the manual.