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Patent Reviews: 3,478,277, 3,479,117, 3,478,662, 3,476,934, 3,478,210, 3,480,875, 3,480,369, 3,483,385, 3,479,620, 3,485,546, 3,485,547, 3,485,552, 3,305,294, 3,393,617, 3,471,701, 3,473,878, 3,474,249, 3,475,078, 3,475,099