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The original PDA.
From IBM\'s website:
IBM\'s Supplies Division introduced the Port-A-Punch in 1958 as a fast, accurate means of manually punching holes in specially scored IBM punched cards. Designed to fit in the pocket, Port-A-Punch made it possible to create punched card documents anywhere. The product was intended for \"on-the-spot\" recording operations -- such as physical inventories, job tickets and statistical surveys -- because it eliminated the need for preliminary writing or typing of source documents.
Pretty nice example of old technology from the 50s/60s. Original box, tablet, 11 extra (in German) punch cards, directions, over and underlays and stylus are included.
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Documentation