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| All Patents in class 356/43 | |||||
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| Number | Date | Patentee | Title | Type | |
| 730,513 | Jun. 09, 1903 | E. Childs | Pyrometer | ||
| 764,622 | Jul. 12, 1904 | A.E. Outerbridge, Jr. | Translucent Color-Comparator or Color-Screen | comparators | |