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| Patents Granted on 1921-08-23 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,388,410 | Aug. 23, 1921 | D.P. Davies | Tractor | tractors | |
| 1,388,671 | Aug. 23, 1921 | H. Terhune | Board Hammer | drop hammers | |
| 1,388,739 | Aug. 23, 1921 | F.H. Miller | Micrometric Indicator | micrometers | |
| 1,388,740 | Aug. 23, 1921 | F.H. Miller | Micrometer Caliper | micrometers | |