Made by Proto and P&C a Proto owned company. Compound leverage pliers. Pat. # 2600512 made fro appox 1954 to appox 1962. I Own 3 pairs of them. 2 pairs of Proto and one pair of the P&C brand. The handle pattern design on one pair of the Proto and the pair of P&C match. The second pair of Proto ones has a different pattern design on the handle. Proto most likely made them for other tool companies also.
EvilDr235