Jon Haugsand wrote:
* R. H.

345 Stop watch with scales for speed measurement.
346 Tool for making square holes
347 Valve handle
348 Kitchen machine (mix master) chunk (or whatever)
349 Funny magnetic experiment. However, I cannot see that there is
really a spool. Might be some sort of magnetic cannon.
350 Your son's mischief tool. Needs a leather patch, a rubber
string and ammunition. (What is this called in English.)

350. Aha! Methinks you may have it :-)
Perhaps a part of a shanghai, ging, slingshot, catapult or whatever
name it may carry around the world. The rubber and shot pouch are
attached to the holes in the two arms.