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Marketing

The former site of "Dragon Manufacturing Company" of Marietta, now an empty building. More than a 100 years ago in Marietta Ohio, Hugo Turner and William Pease were producing oil. They needed a ready supply of pumping equipment and products. They couldn’t afford to pay for down time while waiting for supplies, so in 1912 they bought the Marietta Valve Company and named it “The Dragon Manufacturing Company” because they liked the name.
The "Dragon" was a small, family owned company that catered to, and was trusted by, independent producers in Ohio and western Pennsylvania. Darcova was a large scale, nationwide manufacturer that controlled the market. Because it was the biggest name in valve cups, “Darcova” became a generic term. The name "Darcova" was derived from the Darling Pump Company who, after several years of testing new materials to replace leather, presented the first composition valve cup to the oilfields. The Darling Composition Valve cup was named the “Darcova” cup.
In 1991 the business was sold to three owners from the Rocky Mountain oilfields.
In 1995 the new owners, proud to be a part of the history of these two fascinating, distinguished oilfield manufacturing companies, packed up all the employees who were willing to relocate, loaded all the machinery, molds, patterns and drawings and moved to Billings Montana.

Reciprocated iron wheel-grinder and mortar, often designed to be driven by the feet, not by the hands, though I believe this one is manual. These are commonly seen in Chinese medicine stores and are used to grind dried plants, etc. The crease shape of the mortar ensures the material is beneath the path of the grinding wheel. I doubt that this is new technology but interestingly Hommel (1969) doesn't have a picture of this although the Chaser Mill is similar.