Sentinel_BL_Inside_Back_Label

The back shell of the cabinet holds the antenna, and behind is an elaborate label with related patents.

The back shell of the cabinet holds the antenna, and behind is an elaborate label with related patents.

The back shell of the cabinet holds the antenna, and behind is an elaborate label with related patents. Voltage is indicated a 1 1/2 volts, but folks in those days would’ve known that is only the filament; the plate battery is 90 volts.

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