Well, they're mysterious to me anyway.

The caliper-like tool is labeled "Trico - Milwaukee" and "N11" (or "IIN"). The material is either stiff leather or fiber.

The bottle-opener-like tool is marked "Edlund Co", "Pat Nov 7-33", "Made in USA".

I've seen these often over the years but their use escapes me.

Anyone?

The caliper-like thing is for pulling cartridge (eg glass) fuses. The other one looks like an old bottle opener to me.

That makes sense, because it's non-conductive. That is indeed what it is. It needs about 1 1/2 inches of clearance around the fuse.

I thought the "pliers' were for pullin' plug wires/boots... :shrug:

The other thing sure hits me as a bottle opener, too.

I actually think the other is for opening paint cans

I think it'd be more suitable for pulling plug wires but I found several photos of it captioned as a fuse puller. I've never seen fuses that big, though. Maybe it's for those old house fuses.

I guess I could try to open a bottle and a paint can with the other tool and see what happens.

I tried it. It not only ~opens~ them, it levers the top back on afterward. Very handy little item.

Industrial cartridge fuses get quite large, depending on the current and voltage they are designed for. Here's some up to 3" in diameter, I've seen them as big as my arm.
http://www.bussmann.com/pdf/19ff472c-ae47-4b9b-92d9-9dcacdcd2a66.pdf

phew, glad it worked

The yellow unit with the lines and numbers on it located in the middle is a steel tape measure

GOOD, Rego. Glad ~somebody~ here has a grip on things.

Glad to be of assistance Doc!

Fuse puller and spark plug wire holder for testing spark. The other we used as an oil can ( back in the metal can days, as it wouldn't work to well on the cardboard cans) opener when we couldn't find the spout opener.

That makes sense. I used it the other day to hold a plug wire since it was the only thing I had handy that looked like it'd serve the purpose.

I could ~never~ find a spout when I needed to open a metal topped oil can but usually used a screwdriver corner which worked fine. Except for 40 weight in winter. They opened fine but took forever to pour in 20 degree "heat".