It's a folding rangefinder camera that produced either 6cm x 9cm or 6cm x 6cm negatives/positives. With 620 film that was either 9 or 12 exposures. You can still find 620 film: Velvia 100, Ektachrome E100G (E6), Kodak Portra 160VC (C41), Kodak Plus-X, Tri-X TMax 100, and TMax 400 (B&W). Any place that processes 120/220 film should be able to process 620 film. The only real difference is the spool on which the film is wound. It has a Schneider 105mm lens, which would be equivalent to ~50mm lens on a 35mm camera.
In fantastic condition it may fetch $50. You can use it for just about anything you want, though I suspect most of them these days ensure that shelves and boxes don't float toward the ceiling.
People who do stupid things with dangerous substances often die! -me