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| Patents for Erling Klafstad | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 2,101,682 | Dec. 07, 1937 | E. Klafstad | Relief Valve | |
| 2,183,650 | Dec. 19, 1939 | G.L. Gundersen, E. Klafstad | Relief Valve | ||
 | 2,287,433 | Jun. 23, 1942 | E. Klafstad | System for Safeguarding the Operation of Steam Boilers | |
| 2,355,916 | Aug. 15, 1944 | E. Klafstad | Relief Valve | ||