3512. Schmidt, C. S. Feb. 20. Traps for flies. Fly traps of the type composed of a wire - gauze cage with a small hole in the base are made of angular crosssection and with flat sides, the angles being strengthened by a frame formed of angular pieces of sheet metal.
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机译：3512. C. S. Schmidt，2月20日。苍蝇的陷阱。由金属丝网笼组成的类型的捕蝇器在底座上有一个小孔，它们的横截面呈角形，侧面平坦，由角形的钣金件形成的框架加强了这些角度。
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