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| Patents for John David Caldwell | |||||
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| Number | Date | Patentee | Title | Type | |
| 714,098 | Nov. 18, 1902 | J.D. Caldwell | Shingle Edging Machine | shingle machines | |
| 882,233 | Mar. 17, 1908 | J.D. Caldwell | Shingle-butt-cutting machine | shingle machines | |