key code punch machine
The earliest systems were known as wiring plans and simply consisted of telephone sets keys lamps and wiring. One two or three layered.
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Engraved or imprinted with an identifying symbol andor code number.
. Key was a Bell System term of art for a customer-controlled switching system such as the line buttons on the phones associated. The manufacturing of tablet involves numerous. Key telephone systems are primarily defined by arrangements with individual line selection buttons for each available telephone line.
The compression is done either by a single-punch machine stamping press or by a multi-station machine rotary press.
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