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| All Patents in class 346/32 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,690,517 | Nov. 06, 1928 | C.J. Brown, C.H. Wilson | Electrical controller and recorder | industrial furnaces | |
| 3,239,759 | Mar. 08, 1966 | R.R. O'Hara | Automatic Rebalancing Measuring System Having Auxiliary Actuated Indicator Zero Return Means | scales and balances | |