I love the trademark--"Trustworthy."
The P&C Tool Company was founded in 1920 by two Swedish blacksmiths, John Peterson & Charles Carlborg. Their firm started in Boise, Idaho, but soon moved to Portland Oregon. In 1941, the company was acquired by Plomb, which then became Proto, and then Pendletoon Tool Industries, until being swallowed by Ingersoll Rand which eventually closed down the P&C division in the late 1960's. Ingersoll-Rand's Proto division was sucked into the voracious Stanley Tools empire in 1984.
For a thorough look at the company's history and wares, visit P&C Tool Enthusiasts.