British masks

British gas-masks include the:
 * "Mouth Muff"
 * Black Veil
 * Hypo Hood
 * P/PH Helmet
 * PHG Helmet
 * Small Box Respirator(S.B.R.)
 * MKIII
 * MKIV
 * MKV
 * Civilain Duty Respirator
 * General Civilian Respirator(G.C.R.)
 * Child Respirator(Mickey Mouse)
 * Baby Helmet Respirator(Gas Cradle)
 * Invalid Helmet Respirator
 * Invalid "Hospital" Respirator
 * MK1 Lightweight Antigas Respirator
 * C.7 General Civilain Respirator
 * SR6
 * S10
 * AR5 Flight Crew Respirator
 * AR10
 * SF10
 * FM12
 * CT12
 * GSR