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PCE
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Search for IPC and CPC classification codes or keywords
CPC Subgroup
F41A 3/60

Breech mechanisms for guns having two or more barrels (F41A3/58 takes precedence; for revolving-cannon guns F41F1/10)

Full Title

Breech mechanisms, e.g. locks > Breech mechanisms for guns having two or more barrels (F41A3/58 takes precedence; for revolving-cannon guns F41F1/10)