Electrical signaling device.

Invention Grant

US874372A Electrical signaling device. 失效

Title translation: 电子信号装置。

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Patent Title: Electrical signaling device.
Patent Title (中): 电子信号装置。
Application No.: US1907377576

Application Date: 1907-06-06
Publication No.: US874372A

Publication Date: 1907-12-17
Inventor: WILLIAMS JAMES POLK
Applicant: WILLIAMS JAMES POLK
Assignee: James Polk Williams
Current Assignee: James Polk Williams
Priority: US1907377576 1907-06-06

Electrical signaling device.

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