Number | Name | Date | Kind |
---|---|---|---|
1404183 | Augustine | Jan 1922 | |
2980089 | Sampietro | Aug 1959 | |
3418985 | Hirose | Dec 1968 | |
4380216 | Kandler | Apr 1983 | |
4510897 | Hatz et al. | Apr 1985 | |
4662323 | Moriya | May 1987 | |
4716861 | Fujikawa et al. | Jan 1988 | |
4736717 | Fujikawa et al. | Apr 1988 | |
4872429 | Anderson et al. | Oct 1989 | |
5054440 | Kadokawa | Oct 1991 | |
5176116 | Imagawa et al. | Jan 1993 | |
5267536 | Imagawa et al. | Dec 1993 | |
5293847 | Hoffman et al. | Mar 1994 |
Number | Date | Country |
---|---|---|
338741 | May 1992 | JPX |
Entry |
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"The Little Engine That Could," by Judith A. Gunther, Mar., 1993 issue of Popular Science. |