Pocket Watch Database

Patent Archive
#360234

Patent Information

Watch Balance & Hair Spring Test & Grade

Duane H. Church
John Logan

March 29, 1887

Patent #360234
Manufacturer:Waltham
Patent Number:360234
Description:Watch Balance & Hair Spring Test & Grade
Inventor(s): Duane H. Church
John Logan
Patent Date:Mar 29, 1887
Registration Type:Patent
External Research:https://www.google.c…
Patent Document:  PDF