摘要：

A programmable automatic price setting key for use with a reader to transfer the price to a computer controlled printer for printing the proper base multiple of a commodity. A plurality of price setting tabs have slots therein for insertion on the key, the tabs including two rows of holes, one for clock-pulse generation and the other for supplying coded data. The reader unit incorporates a slot for the key and includes a light source and diffusing lens system along with a slide head with photodiodes positioned to pass over the rows of holes and thereby generate a series of pulses in binary code, corresponding to human readable characters on the key tabs, for transfer of the code to the computer.

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