(LO) TECH GADGET: WHAT IS IT?

Here’s an attempt to have some fun - or at least puzzle over an old - say (lo) tech gadget or invention. You tell me - WHAT IS IT?

If you think you know - clink on the link below and write your answer. If you get it right - we have a somewhat expanded treatise on how to start your invention and info on patent searches. If you are more into gadgets and gizmos - well - try your intelligence anyway. I’m curious to see how many people know what the WHAT IS IT? - is.

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WHAT IS IT?

The answer and source will be given after you have played along for awhile. Keep coming back if you want to know. If you don't want to know - come back anyway. We will have other "whatsitz" for you to try to identify.