Can you ID this thumb screw clamp?

[3jakes]

This clamp reminds me of my grandmother's treadle Singer.
Holds items at a right angle to each other.
Can anybody ID it?

 

[Mintgrun]

Those are also used to set up laboratory equipment.



Tom

 

[RTM]

Yup, lab equipment.

 

[3jakes]

Would have never guessed that.
Thanks.

 

[4xdog]

I probably have some of those in my stash too -- spend a career in industrial chemistry labs and stuff like that tends to accumulate.