Here, I am starting a small (and unofficial) chronicle of the Visual Products Machines produced by 3M.
It's my intent to overview some of those machines for posterity, from the view of people who dealt with them. I'm one of those people, so you will be hearing from me, for now.
3M assigned a sequential internal numerical model number for each machine. Then, the marketing department of each manufacturing division assigned a sales name
(often a number-name) to it for field use.
I will begin by listing some of them:
Model Sales-Name or Number Description
42 ?? The first 3M Overhead Projector,
43 ?? Next Model, slightly portable.
60 Early, smaller, portable Overhead Projector
66 Very popular Fixed Head Overhead Projector
98 ??? Special Version of model 45 Secretary Thermofax Machine used for making Projection Transparencies
88 ??? DuckBill Portable, Foldable Overhead Projector with only convection cooling
625 AGR THE SIX TWENTY FIVE VISUAL PRODUCTS SOUND ON SLIDE PROJECTOR RECORDER
Pages 10 & 11 of this 3M document provide a nice Visaul Products History
As far as I know, this 3M Division is still alive and well.
If you'd like to contribute an article about any one of these machines, please use the contact link at the top of this page to let me know.