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| Patents Granted on 1858-04-20 | |||||
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| Number | Date | Patentee | Title | Type | |
| 19,978 | Apr. 20, 1858 | J. Batchelor | Dressing-saw | saw gummers | |
| 19,983 | Apr. 20, 1858 | R.M. Cosby | Crosscut-sawing machine | reciprocating saws | |
| 20,010 | Apr. 20, 1858 | D.H. Whittemore | Bit holder | brace chucks | |
| 20,016 | Apr. 20, 1858 | A.H. Boyd | Machine for making wooden dowel-pins | dowel making machines | |