The warmers have never been used, however they do show signs of having been sitting on a shelf for all these years along with the remains of the box.
Asking $145 plus postage.
(Please Note: The remains of the box have been flat folded and glued to card stock by the previous collector)
The Electric Grip Warmer patent
Even J. Rohne
Electric Heater for Steering Wheels
Patent number: 1345249
Filing date: Sep 7, 1917
Issue date: Jun 29, 1920