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electrical devices for aluminum wiring

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I believe they first appeared in the late 1960's. The early devices were labeled with CU/AL.

The early switches/receptacles with the CU/AL specification did not work well and a new specification noted as CO/ALR (Copper/Aluminum Revised) was implemented.

The new specification/design was better at dealing with the aluminum wiring.

Bottom line ... late 1960's.

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