0310970-A1 is referenced by 7 patents and cites 4 patents.

Device for preventing the inflow of air into a gas mask during the substitution of its filter (1) in the presence of contaminated atmosphere. The device comprises a small plate (12) having a central stem (13) which passes through the support (9) of a check valve admitting air to the respiratory tracts and a spring (14) which pushes said small plate (12) against the diaphragm (7) of the check valve when the filter is removed from the mask.

Title
Device for replacing the filter of a gas mask in polluted atmosphere without any contamination risk.
Application Number
EP19880116261 19880930
Publication Number
0310970 (A1)
Application Date
September 30, 1988
Publication Date
April 12, 1989
Inventor
Moscatelli Romano
Cappa Giulio
Assignee
Mini Difesa
IT
Pirelli
IT
IPC
A62B 09/04
A62B 09/00
A62B 09/04
View Original Source Download PDF