1. Ventilation valve
2. Ventilation valve
Figure 1.1 of a first embodiment of a ventilation valve showing our new design;
Figure 1.2 is another perspective view thereof is another perspective view thereof;
Figure 1.3 is a front elevation view thereof, the rear elevation view being the minor image of Figure 1.3;
Figure 1.4 is side elevation view thereof, the other side elevation view being the mirror image of Figure 1.4;
Figure 2.1 of a second embodiment of a ventilation valve showing our new design;
Figure 2.2 is another perspective view thereof is another perspective view thereof;
Figure 2.3 is a front elevation view thereof, the rear elevation view being the minor image of Figure 2.3; and
Figure 2.4 is side elevation view thereof, the other side elevation view being the mirror image of Figure 2.4.
