I mentioned this thread to my wife. She claims we still have several slide rules around the house which she has come across on various occasions. We may even have one of her dad's, dating back to the 1930's, from when he was in engineering school. Mine date to the 50's and 60's. I no longer have any of the circular ones which were in such vogue in the early 60's - they were plastic and the center rivet always seemed to pull through the plastic, destroying the instrument.
I do recall wearing mine like a dagger in a sheath on my belt.
Back in the late 70's, the treasurer of our investment bank had one in a glass case on a wall in our "computer room" (remember those?), with an engraved plaque which read, "In event of power outage, break glass!"