F41A 21/28 Gas-expansion chambers; Barrels provided with gas-relieving ports (F41A1/06, F41A13/08 take precedence)
Introduced: January 1990
Title
Titles differ between systems:
IPC: Gas-expansion chambers; Barrels provided with gas-relieving ports
CPC: Gas-expansion chambers; Barrels provided with gas-relieving ports (F41A1/06, F41A13/08 take precedence)
Full Title
Full titles differ between systems:
Barrels or gun tubes; Muzzle attachments; Barrel mounting means > Gas-expansion chambers; Barrels provided with gas-relieving ports
Barrels; Gun tubes; Muzzle attachments; Barrel mounting means (F41A25/00 takes precedence; barrel attachments for firing grenades or riot-control ammunition from smallarms F41C27/06) > Gas-expansion chambers; Barrels provided with gas-relieving ports (F41A1/06, F41A13/08 take precedence)
No child classifications to compare. This is a leaf node in both IPC and CPC.