Thunderbird Roadbuilders- even the name evokes feelings of ruggedness! The models shown are the 700RB owned by Teevin Bros. (Knappa Oregon),
the 800RB owned by Jerry DeBrie (Cathlamet Washington) and the 900RB owned by Pacific Lumber and Shipping (Randle/Packwood Washington).
As seen several other models were also available including the 1100RB, a 140,000 lb monster excavator capable of destroying big stumps.