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Patent:US4425499
10.01.1984 Newton, Roger A. (Brookfield, WI) : Decision tree graphical computer
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14.02.1984 Veronica A. Buffington Federal Paper Board Co., Inc. : Data guide device
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15.05.1984 Poll Marian : Ellipsograph
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15.05.1984 Currie, Richard A. (833 S. Burgess Dr., Baton Rouge, LA : Arithmetic instruction apparatus
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29.05.1984 Pickios, Anthony G. : Method of fabricating a hand calculator
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12.06.1984 Sehres, Lynn (2730 W. Van Buren, Phoenix, AZ 85009) : Bra-size calculator
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12.06.1984 Merl, Milton J. (New City, NY) : Multi-variable analog computer
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26.06.1984 Harter, Burleigh W. (823 Canyon Rd., Redwood City, CA : Time/speed/distance slide rule
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21.08.1984 Argiro, Jason (Rd. 1, Box 367, Highland, NY 12528) : Cuboid block, instructional device for multiplication tables
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09.10.1984 Lorne G. Sampson : Calculator
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23.10.1984 Ralph Holmes : Calculator and apparatus for macrophotography