So, I’m reading the Novel “True Grit” aloud to my wife. One of the incidental characters is described as a “pocket calculator” salesman. Which led Pamela Mae Lyon to ask, what a pocket calculator would be, back in that time frame. A quick google turns up the following thread
http://www.wordorigins.org/index.php/forums/viewthread/3455/. As an aside, Pam has seen neither of the “True Grit” movies, so this is a “cold” book to her.