DIFF Subgroup
G04B 39/02 Sealing crystals or glasses
Introduced: January 1980
Full Title
Full titles differ between systems:
IPC:
Watch crystals; Fastening or sealing crystals; Clock glasses > Sealing crystals or glasses
CPC:
Watch crystals; Fastening or sealing of crystals; Clock glasses > Sealing crystals or glasses
Of 1 combined children, 0 exist in both systems.
1 codes are CPC-only extensions.
Child Classifications
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