A variation of the GP-5 gas mask is the GP-5m, which features a circular piece of metal that contains a thin piece of plastic on the inside, which acts as a voice diaphragm ('voicemitter'), as well as the dubious design for ear holes, which compromised the seal of the mask. The military version of the GP-5 uses a near-identical facepiece but with an elongated filter housing, to which is fitted a hose which in turn connects to a tall can-type filter which remains supported in the mask's haversack whilst the mask is worn. The GP-5 and military version were issued respectively to the civilian population and armed forces of the Soviet Union and it's Warsaw Pact allies, among which they were given differing designations. The East German Armed Forces designated the military version the SchM41M, and the variant with small eyepieces and a voicemitter for those with a need to use optical equipment (. officers - binoculars) was known as the SchMS.
i bombed bombed & …..rebombed… over and over and over unplugged everything put raid heavy infestation bombs behind my fridge in cabients removed couch covers sat bombs on the couch. put bombs on counter top, then sit the coffee pot on top of a freshly spayed area . i would set off 5 or 6 in each room every day for 2 wks. use a mask to cover your face when setting them off. i used roach motels also …havent seen 1 in10 months, i dont put food in gabage can inside, i bleach the sink &counters every nite… roaches hate clean… just use a bomb or 2 in the areas where the heaviest infestation was every six months to make sure they dont come back ,, even if u dont see them…. i never had them ever until a friend moved in with an infested coffee pot & boom i was so freakin over run with those things , i thought i was gona have to burn my house down to get rid of them but i didget rid of them, i feel for ya…GOOD LUCK