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| All Patents of Type: spark plugs | |||||
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| Number | Date | Patentee | Title | Type | |
| 660,786 | Oct. 30, 1900 | E.T. Birdsall | Sparking-Plug for Explosive-Engines | spark plugs | |
| 925,239 | Jun. 15, 1909 | F.W. Smith | Spark Plug | spark plugs | |
| 1,401,585 | Dec. 27, 1921 | V.D. Collins, A.F. Collins | Spark Plug | spark plugs | |