The 5/16" (7.9375mm) central connector is a specialized type of thread used mostly for self contained breathing apparatuses, but occasionally they are used as connectors for filtering respirators.
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Leyland license in Czechoslovakia -
Dräger KG rebreather series -
Leder B-Maske -
Auer and Degea 700 series masks -
H.S.S. Gerät 1924 -
E1 -
Selbstretter 1924 -
GS / GSP-M
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