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| File information | |
| Filename: | us0d0007186-001.jpg |
| Keywords: | Philadelphia / Pennsylvania / James Gillinder / Frederick R. Gillinder / Benjamin Morison / William H. Morison |
| Inventor's Name: | Thomas W. Mellor |
| Patent Date: | February 17, 1874 |
| Pattern Name/Number: | Mellor aka Block and Circle |
| Original Manufacturer: | Gillinder & Sons |
| Date added: | Apr 21, 2019 |