Vintage Automotive Tool?

[chevy6974]

Hello!
New member here, trying to identify this pair of pliers possibly Automotive?
The only marking on them is Pat Pending, came out of grandmas estate, thought they might be snap ring pliers but not sure, any help would be appreciated.

Thanks

 

[RECox286]

Piston ring spreader ?

Uncle Bob

 

[abk241]

Piston ring spreader ?

Uncle Bob

Maybe...hard to tell how thick those tips are.

 

[chevy6974]

The tips are just a hair over 1/8" thick

 

[kansei]

+1 to Uncle Bob