squaring shears

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Parker Manufacturing Company — Shear manufactured at the Parker plant. Parker Manufacturing Company was a machine shop during WWII, a manufacturer of machine tools, a manufacturer/distributor of metal kitchen cabinets and sinks, and an industrial landlord, in Santa Monica, CA … Wikipedia
Shearing (metalworking) — Shearing is a metalworking process which cuts stock without the formation of chips or the use of burning or melting. Strictly speaking, if the cutting blades are straight the process is called shearing; if the cutting blades are curved then they… … Wikipedia

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