According to R.H. :
The latest set has just been posted:

http://puzzlephotos.blogspot.com/

As usual -- posting from rec.crafts.metalworking.

780) An inexpensive splicer for standard 1/4" magnetic recording
tape. There are much better splicing blocks (or used to be),
but this is what you would probably get the first time around.

This one was intended to be used with the 1/2" wide splicing
tape, at right angles to the recording tape.

The "Cut" position of the sliding head put a cut like this '\'
through both layers of the overlapping tape ends, after which
you lifted off the top stub, and applied the splicing tape
(opalescent white and thin) at right angles to the length of the
tape.

Then, you slid the head to the "trim" position, where it applied
two curved blades to trim the edges of the tape like this:

| |
) (
| |

to trim off the splicing tape which hangs over the sides and a
little of the edges of the tape itself. This makes sure that
the splice is not too wide to go through the guides on the tape
recorder/player.

The good splicing blocks have no side trimming, the cuts are
done with a hand-held single-edge razor blade, and the splicing
tape applied is either slightly less than 1/4" wide, applied
along the length, or has a backing which peels off after the
splice is made to assure that the spliced tape is not too wide.

781) I can only guess here -- perhaps used for sifting clams out of
bottom muck?

782) Again, I've never seen anything like this, so I am limited to
guesses. Perhaps to pull two board ends tight together prior to
nailing down?

783) This looks like a tripod mount for a telephoto lens for a
serious camera. Some telephotos have a built-in tripod
mount, others have removable ones -- or even after-market ones
from other makers.

The knob also allows it to be loosened so you can rotate the
camera body for either portrait or landscape mode at need.

784) Hmm ... part of an early combination lock? Normally, the
rotating discs with the holes would be behind knobs (which could
be fitted with pins in any of the holes to offset the actual
combination from the visible one on the knob, unless the numbers
visible through the aperture were not covered by the knobs.

785) Some form of grappling hook. I think for picking up groups
of sticks. The horizontal curved bar at the bottom holds the
jaws open until it is dropped onto the potential load, at which
point it is kicked out.

Once that happens, the load itself (and the weight of the hook)
closes the jaws.

I'm not sure what the notches just above the pivots (on the
"ears" engage -- though there might be a pin on the back of the
center upright, which would require the jaws to be fully opened
to nearly horizontal.

Now to see what others have said.

Enjoy,
DoN.
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