Patent Model - Improvement in Spring-Links
Maker and role
William Campbell, Patentee
Mar 06 1877
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16 x 16 1/2 x 1 1/2" (40.6 x 41.9 x 3.8cm)
Campbell's patent "has for its object to facilitate the attachment and detachment of links in a chain or similar connection; and it consists in the novel construction of a link..." (Patent Number 188,101)
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