Max E Crandall received patent number 1,061,662 on May 13, 1913 for the Crandall Expert Wrench. This was his only patent found. The Expert Utility Company was founded in Cincinnati, Ohio to market the wrench. Ads were placed in Popular Mechanics magazine for a few months in 1913. There is a directory listing for the company in 1915.
The wrench has a pivot and a paw to adjust the angle of the head. The heads can be changed. It came in a set with four size heads. Other wrenches exist with some similarity to the Crandall. Some have heads that ratchet, some pivot to change the angle, and some are adjustable.
A few variations on the idea include the Any Angle adjustable, Burgess-Norton, and Stephen.
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