Number | Date | Country | Kind |
---|---|---|---|
3446128 | Dec 1984 | DEX |
Number | Name | Date | Kind |
---|---|---|---|
2265352 | Corbin et al. | Dec 1941 | |
2900547 | Engel | Aug 1959 | |
4539503 | Esper et al. | Sep 1985 |
Entry |
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Bosch advertisement for "Platinum Spark Plug". |
J. C. Whitney & Co cataloge; p. 172. |