From verso of card: "The picture shows the RIGHT way to take off a Civilian Respirator. This should be done by slipping the head harness forward from the back of the head. . . . The WRONG way to take it off is by taking hold of the metal box containing the filters and pulling the face-piece off the chin. By this method there is a danger of bending and cracking the transparent window. If this window is cracked, the respirator is useless."