My father wrote his thesis on the Berger-Rees air tong at Washington State University, in about 1951. He still has it in a dresser drawer, and I have asked to have it when he leaves this world. I read the whole thing years ago.
In fact, Contract Logger, you and my father probably know each other. He built the smaller of the two docks (the one upstream) at the Bay City Yard in Cosi. I was there too, as a wee lad. He was also Superintendent at Vail from 1968 to 1972, and was the last Mayor of the town ov Vail. He was also the one who bought Art Smythe a brand new stacker to replace that antiquated cable reload powered by the old Washington Iron Works loading donkey at Vail. How good is your memory?