| Name | Northern Electric QSD300A1 Payphone |
| Date | late 1960s–early 1970s |
| Manufacturer | Northern Electric |
Development of the Northern Electric QSD300A1 Payphone
| The QSD300A1 is a flat-panel, single-slot prepay payphone designed for central-office-controlled operation. It accepts mixed coin denominations through one slot, using an electro-mechanical coin relay for collect and return supervision. |
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