What is the usage of this clamping device?
Timesaver Co.  X-1  Dallas Tex.  Pat. No. 256829 (??? - number hard to read).

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The Patent number is 2,568,294  Granted Sept. 18, 1951. The patent describes it in relation to disassembling automotive exhaust systems.
Cheers

Wow!  Thank you Danks!  I will look it up.  It did sorta look like there was an extra figure at the end of the numbers.

http://www.datamp.org/patents/search/advance.php?pn=2568294&id=25393&set=1