11 1 10 1982 The United Patent Office Editor mixed material Washington Washington : The United Patent Office, 1982 1982 WhatsApp_Image_2023-12-22_at_14.08.08.jpeg.jpeg 1981 The United Patent Office Editor mixed material Washington Washington : The United Patent Office, 1981 1981 WhatsApp_Image_2023-12-22_at_14.08.09.jpeg.jpeg 1979 The United Patent Office Editor mixed material Washington Washington : The United Patent Office, 1979 1979 WhatsApp_Image_2023-12-22_at_14.18.53.jpeg.jpeg 1978 The United Patent Office Editor mixed material Washington Washington : The United Patent Office, 1978 1978 WhatsApp_Image_2023-12-22_at_14.21.14.jpeg.jpeg 1974 The United Patent Office Editor mixed material Washington Washington : The United Patent Office, 1974 1974 WhatsApp_Image_2023-12-22_at_13.53.00.jpeg.jpeg 1975 The United Patent Office Editor mixed material Washington Washington : The United Patent Office, 1975 1975 WhatsApp_Image_2023-12-22_at_13.56.47.jpeg.jpeg 1976 The United Patent Office Editor mixed material Washington Washingto : The United Patent Office, 1976 1976 WhatsApp_Image_2023-12-22_at_14.00.12.jpeg.jpeg 1977 The United Patent Office Editor mixed material Washington Washington : The United Patent Office, 1977 1977 WhatsApp_Image_2023-12-22_at_14.08.13.jpeg.jpeg 1970 The United Patent Office Editor mixed material Washington Washington : Government printing office, 1970 1970 WhatsApp_Image_2023-12-22_at_13.41.52.jpeg.jpeg 1971 The United Patent Office Editor mixed material Washington Washington :The United Patent Office, 1971 1971 WhatsApp_Image_2023-12-22_at_13.47.12.jpeg.jpeg