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| All Patents in class 250/206 | |||||
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| Number | Date | Patentee | Title | Type | |
| 685,954 | Nov. 05, 1901 | N. Tesla | Method of utilizing effects transmitted through natural media | ||
| 685,956 | Nov. 05, 1901 | N. Tesla | Apparatus for utilizing effects transmitted from a distance to a receiving device through natural media | ||
| 685,958 | Nov. 05, 1901 | N. Tesla | Method of utilizing radiant energy | ||
| 2,441,403 | May 11, 1948 | B.N. Engle, J.B. Engle | Teeth setter for saws | saw sharpening machines | |