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Animals pulled the load on early tread powers

Westinghouse two-horse tread power and No. 4 thresher
The Westinghouse two-horse tread power and No. 4 thresher from an 1886 Westinghouse Co. catalog. Sold as a set, this combination cost $525 (roughly $12,209 today). An elevator for bagging and tallying grain cost an extra $25.