Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . Lever-Presses, requires, or the weight is shifted in or out on thelever. See A j)rocess of rubbing a moist Fig. Duplex Lever-Pttnch. material between two hard surfaces, as in grindingpigments and printers ink. LEWIS. 1299 LIEBERKUHN.

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