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| All Patents in class 313/143 | |||||
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| Picture | Number | Date | Patentee | Title | |
| RE10,878 | Nov. 01, 1887 | A. Schmid, J.C. Beckfeld | Gas Engine | ||
| 424,027 | Mar. 25, 1890 | E.F. Roberts | Igniting Apparatus for Gas Engines | ||
| 925,239 | Jun. 15, 1909 | F.W. Smith | Spark Plug | ||
| 1,401,585 | Dec. 27, 1921 | V.D. Collins, A.F. Collins | Spark Plug | ||