![]() ![]() Accordingly, General Mathieu turned to Lt. After reviewing the blueprints in February 1892, the French artillery engineers advised that a gun should be produced without purchasing the Haussner invention. In 1891 Haussner sold his patents to a firm named Gruson, which searched for potential buyers. Krupp would later reject Haussner's invention, due to insoluble technical problems caused by hydraulic fluid leakage. They also learned that Krupp was considering introducing the system after testing it. But even before the 57 entered testing, in 1890 General Mathieu, Director of Artillery at the Ministry of War, had been informed that Konrad Haussner, a German engineer working at the Ingolstadt arsenal, had patented an oil-and-compressed-air long-recoil system. The only major design difference between the 57 and 75 that would emerge was the recoil system.
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