Patent
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Patent:US5080592
14.01.1992 Laghi, Aldo A. : Variable action quincunx pinplate
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Patent:US5084609
28.01.1992 Saber Gilbert F : Trigonometric Slide Rule
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23.06.1992 Enrique, Castaneda-Mori : Ellipsograph as a drafting tool
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23.06.1992 Langston, Charles F. : Irregular surface ellipsograph
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28.07.1992 Hiromori, Junji (P) Hiromori (P) Inv. : Combined electronic calculator and abacus with deflective guide bars
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11.08.1992 Tamburro Jr Louis : Part number Slide Rule apparatus
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11.08.1992 Henry R. Angel : Analog slide display
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15.09.1992 Driscoll, William A. (Maplewood, MN) : Mechanical device for determining the modulus and loss factor of a damping material based upon temperature and frequency
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22.09.1992 Ylitalo, Howard (R.R. 2, Box 106, Cokato, MN 55321) : Manual teaching calculator
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Patent:US5173566
22.12.1992 Hiraoka, Tadashi : Apparatus for rapid reference to musical scales