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| Patents for Richard L. Campbell | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,155,890 | Apr. 25, 1939 | R.L. Campbell | Heating System | heating apparatus | |
| 2,176,852 | Oct. 17, 1939 | R.L. Campbell | Heating Method and Apparatus | heating apparatus | |