Citada por|
| US4062180 | 31 Jul 1975 | 13 Dic 1977 | | Electronic chess clock | | US4168623 | 7 Feb 1977 | 25 Sep 1979 | Philip Morris Incorporated | Method for determining volatile content of a sample | | US4438500 | 13 Abr 1979 | 20 Mar 1984 | CEM Corporation | Rapid volatility analyzer | | US4464060 | 4 Abr 1983 | 7 Ago 1984 | | Electronic chess clock | | US4681463 | 12 Sep 1986 | 21 Jul 1987 | | Differential timer | | USD500254 | 28 Ene 2004 | 28 Dic 2004 | TIC-Citizen Co., Ltd. | Clock |
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