Positive Pressure powered respirator MK5 (to BS 4558 and 4771) Serial No.500658, with battery powered motor fan unit on a waistbelt, by Martindale Protection Limited, Neasden, London, England, 1975-1981 Positive Pressure powered respirator MK5 (to BS 4558 and 4771) Serial No.500658 1975-1981
