Patented April 10, 1877
If an object in your hands says PAT. APRIL 10, 1877, it may be one of these.
| Patent | Title | Inventor | Of |
|---|---|---|---|
| US 189,391 | IMPROVEMENT IN ELECTRO-PNEUMATIC MUSIC-PLAYING APPARATUS. | William Ford Schmoele and Henry Schmoele, Jr. | Philadelphia, Pennsylvania |