Combined ring and spring apparatus

Miscellaneous – Miscellaneous

Patent

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Details

D21692, 2102

Patent

active

D04098161

REFERENCES:
patent: 754992 (1904-09-01), Grabner
patent: 1123272 (1915-01-01), Goodman
patent: 1307905 (1919-06-01), Hendrickson
patent: 2919134 (1959-12-01), Zuro
patent: 4611805 (1986-09-01), Franklin et al.

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