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Long Island City, New York, to manufacture various automotive and aircraft accessory products. His firm prospered and became widely recognized as a leader in this field.

Mr deGiers became one of the first members of The Early Birds of Aviation and was soon active in the affairs of that unique organization, serving as preside during 1954-55. In 1953, to participate in the world-wide celebration of the 50th year since the attainment of controlled and powered human flight by the Wright brothers in a heavier-than-air craft, he formed a committee of Early Birds to plan and arrange for the erection of a monument on Governors Island, New York City harbor. That island had been the location for a number of famous flights by aviation pioneers including many members of the Early Birds. The monument has a marble base surmounted by a bronze copy of a propeller from the world's first military airplane. That airplane had been produced by the Wright brothers and was flown during its acceptance flight by Orville Wright at Ft. Myer, Virginia, July 1909. The original airplane is in the National Air and Space Museum.

During World War II the deGiers Liquidometer Corporation produced quantities of Army and Navy instruments and accessory equipment for the war effort. Later, he retired to his home on Long Island, enjoying his companionable memberships in the Early Birds, the Quiet Birdmen, and the Wings Club of New York City.

Flying pioneer Clarence A. deGriers was one of the original group of flying enthusiasts to confidently take a serious interest in aviation. He contributed an important part in early American aviation history. The monument on Governors Island is a memorial to his airmindedness, capability and patriotism, as well as to the men as women whose names are inscribed theron.

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