We had a couple of those when I was younger. I used them to make french fries and potato chips. My mom used one to dice onions with when she made chili for the tavern she worked out. She used another one can't remember what it was called but it was tall and had a crank handle and suction base to hold it still on the counter.
In the 1970s we bought mom a "Kitchen Magician" which she used... twice. It sat on the top shelf of the pantry emprisoned for the rest of time.
The suction cup on the bottom could suck the chrome off a bumper!
I used mine to make scalloped potatoes on Christmas Eve. Nothing like a Veg-O-Matic to cut down on prep work!
In related news, I saw a new Veg-O-Matic in the aisle of Craptastic Gifts at my local Rite Aid. Didn't stop to examine it because, well, why bother? I have the original!