🚀 go-pugleaf

I happen to have my CARDIAC and its instruction manual sitting here on my desk.
It did indeed come from Bell Labs.  The "machine" itself bears the info

	Copyright (c) 1966, 1968 Bell Telephone Laboratories, Incorporated
	"cardiac" developed by David Hagelbarger

while the manual credits are

	by David Hagelbarger
	   Saul Fingerman
	Cartoon illustrations by A. Barthelson
	Copyright (c) 1968 Bell Telephone Laboratories, Incorporated

It's a very clever little gadget, and I remember being extremely impressed by
this thing in my high school days.  It's still pretty impressive.

CARDIAC was just one of many really great educational aids I recall being put
out by Bell Labs, Western Electric, etc.