Patent
-
Patent:US4504234
12.03.1985 Jarvis, Arthur B. (Shrewsbury, MA) : Aiding mathematical learning
-
Patent:US4516013
07.05.1985 Hester, Robert W. (Rte. 1, Box 1B, Fairfield, NC 27826) : Decoying calculator
-
Patent:US4538055
27.08.1985 Riehle, Harald (P) : Slide Rule
-
Patent:US4552052
12.11.1985 Lee, Chung-Yang (4th Fl., No. 8, Chung-Yang Rd., Hsin-Tien, : Modulation rule
-
Patent:US4614365
11.02.1985 Tresser, David (P) : Interest-bearing instrument kit
-
Patent:USD277871
05.03.1985 J. E. Bubash : Conversion Calculator