3M Expansion Relay Board 78-8095-0808-4 Rebuilt- Exchange (Cores Required) Item Code P36E.

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3M C5108 Station Controller for use with Item Code P19E C5208 and Item Code P20E C5216 Station Selectors - Rebuilt- Exchange (Cores Required) Item Code P31E.

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3M Station Controller for D2475 Selectors OEM Part # 78-9236-6752-7/C5416AA Rebuilt -  Item Code P30E.

Contains two I/O Cards and is used with station selector Item Code P24E

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3M 481BA (D20) Intracom Voice Activated OEM Part # 78-9236-2877-6 Rebuilt - Item Code P2E.

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3M Station Controller C5116 - 3M Part # 78-9236-6384-9 Rebuilt / Exchange (Cores Required) Item Code P29E.

Used with 3M Station Selector Item Code P20E

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See Item Code 7122 for power supply used with this Controller up to 16 stations.

D2470 - 3M Station Controller 16 Station - Rebuilt Exchange Item Code P28E