| Number | Name | Date | Kind |
|---|---|---|---|
| D256890 | Diskin | Sep 1980 | |
| D258808 | Diskin | Apr 1981 | |
| 864533 | Hadley | Aug 1907 | |
| 1929582 | Greenwood | Oct 1933 | |
| 3593515 | Shockner et al. | Jul 1971 | |
| 3849978 | Davis | Nov 1974 | |
| 3875736 | Gulko | Apr 1975 | |
| 4280211 | Mayenschein | Jul 1981 | |
| 4370064 | Hicks et al. | Jan 1983 |
| Entry |
|---|
| Immanuel Kant, Critique of Pure Reason, Meiklejohn Translation, pp. 48 to 53. |
| Albert Einstein, Relativity (Crown Publishers, 1961) pp. 9, 10, 91 to 93, 154 and 155. |
| Richard P. Feynman, Quantum Electrodynamics QED (Princeton University Press, 1985), p. 111. |
| Advertisement by Natico Originals, Inc. (Oct. 1987) "Museum Clock". |