Jeffery-Dewitt post insulator patent # 1952517

By Mid Norris; posted December 10, 2016

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Per ICON insulator patent reference library this patent was assigned to JD March 27,1934 for a post insulator or stacker for assembling a switchgear mechanism.

Here is a photo of one of mine. It came off a large switch that I picked up in Montana some years ago. I had to disassemble it for the trip back to Oregon. Additional photos will show the switch as acquired and later disassembled.

These are uncommon in my experience but I have seen pieces here and there from Montana collectors/dealers at swap meets.