July 1931 Machinery Trademarks by day
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| 19 | 20 | 21 | 22 | 23 | 24 | 25 |
| 26 | 27 | 28 | 29 | 30 | 31 |
Machinery Trademarks filed in July 1931
THE AIRPORT
Filed: July 11, 1931
VALVES-NAMELY, AIR VALVES FOR STEAM RADIATORS
Owned by: HOFFMAN SPECIALTY COMPANY
Serial Number: 71316841
