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This PDF should print out in exactly the right proportions to be used as an overlay for my ZX81+35 keyboard made from forty 6x6 mm buttons mounted on a perfboard, and hand wired, or on my Keyboard PCB. 
The circular holes in the middle of each key can be punched out, and will fit over the plungers of the keys
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mahjongg2 2019-07-31 12:56:06 +02:00 committed by GitHub
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