Patent

Patent:US317438 05.05.1988 Arthur M. Burnham Joseph R. Bodwell : Counting attachment for machines
Patent:US325260 09.05.1988 Walter H. Maxwell : Cash register and indicator
Patent:US327970 00.05.1988 Lawrence W. Swem : Adding Machine
Patent:US368163 08.07.1988 Daniel Orme Francis Heans Orme : Register for throstles and other spinning machines
Patent:US382552 05.08.1988 John H. Patterson : Cash indicator and register
Patent:US399129 03.09.1988 Franklin W. Brooks : Coin-operated calculating-machine
Patent:US4737619 12.04.1988 John Freedom Thomas Freedom : Fertility calculator
Patent:US4749846 07.06.1988 Robert M. Deaver : Price comparison device
Patent:US4752674 21.06.1988 Zev Rosenwaks : Calculator used for displaying ovulation synchronization of donors and recipients in embryo transfer procedures

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