https://www.datamp.org/ Recently added patents en-us https://www.datamp.org/patents/displayPatent.php?id=86076&pn=1,949,128 Ignition point file Patentee: Rikio Nakano - Honolulu Territory of Hawaii Granted:1934-02-27

Small, thin file with one end designed as a spring "pocket clip." The specifications differentiate this design from files in patent nos. 1,671,811 and 1,663,089. Known examples made by HELLER BROS. (Newark, NJ), and also marketed by PLOMB Tool Co.(Los Angeles, CA).
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