Letters of George B. Prescott to the commissioner of patents, in reference to the inventions conveyed by the assignment of Thomas A. Edison for duplex and quadruplex telegraphy
Letters of George B. Prescott to the commissioner of patents, in reference to the inventions conveyed by the assignment of Thomas A. Edison for duplex and quadruplex telegraphy
Details
- OL Work ID
- OL35602745W
Subjects
TelegraphDuplex systemPatentsQuadruplex systemPatent suits