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- Description is exactly "A circular produced by Roberts, Thorp & Co. advertising the products that the company produces. This circular primarily focusses on a product called the "vibrating invincible thresher"."
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Roberts, Thorp & Co. Thirty-Fourth Annual Descriptive Circular
A circular produced by Roberts, Thorp & Co. advertising the products that the company produces. This circular primarily focusses on a product called the "vibrating invincible thresher".