Cool post. Thanks! I’ll go and look.
Way back in another lifetime I worked for Minnesota Mining and Manufacturing.
The pranksters would find him up a tall ladder and start talking to him. They did it well, with no words. He always came down the ladder and shook his hearing aids and tried to see why they weren’t working. Big laugh; then he’d get back to work.
I got to sit in the machine shop. Their prank for me was to put a peace of heavy steel on top of 4 drums. 5 pound hammer on it. If they saw me on the phone they’d walk by, and hammer all the way walking by. Deafening noise. Literally.
His hearing aids were exactly those shown on the top of the museum home page, in the corner.