| Name | GRAY REGISTERS |
| Date | 1920 |
| Manufacturer | Gray Telephone Pay Station Company |
Development of the GRAY REGISTERS
| The Gray registers were mechanical counting devices developed by William Gray to record the number of calls made from a payphone. Installed within or alongside early pay stations, they allowed operators to audit usage independently of coin collection. This separation of call counting from cash handling was crucial in commercialising payphone operation, enabling reliable revenue tracking, reducing fraud, and supporting large-scale deployment of public telephones. |
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