In article ,
R.H. wrote:
Just added another set:

http://puzzlephotos.blogspot.com/

If you haven't seen it already, over the weekend I added a scanned shot from
an 1894 edition catalog, that verifies #313, the burner cleaner. It's on
the answer page to last week's post, thanks to Bill for sending that to me.

Again -- answering from rec.crafts.metalworking

315) "Skeleton" keys -- used for morticed door locks for internal doors
in a home. These look pretty new, but the locks which they fit
are probably quite old.

316) Hmm ... perhaps for holding typewriter typefaces on the
typebars while they are being soldered in place?

317) Your puzzle photo is a photo of a puzzle. :-) I think that the
blocks are each hinged to one or more adjacent blocks, and one
solution is to make a solid cube with them.

318) The joining part of a stethoscope? The two earpiece hoses
connect to the upper right, and the single hose going to the
"pickup" connects to the lower left.

319) Hmm ... seals and protects something. Perhaps a bleed vent for
steam or compressed air?

320) Perhaps another typewriter repair tool? I'm not sure that even
having it in my hands would tell me more. :-)

Enjoy,
DoN.

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