University of California

The Rule 3-4 and the Ratcliff 3-4 both originate at the University of California. Both of these instruments feature the same 10 mm terminal shank as the Barnhart 5-6. However, in both cases, the blades are offset more from the instrument handle, about 45⁰ as opposed to 33⁰. The Ratcliff also features a slightly thinner blade.


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