score:5
Picture 1:
Belüftung
-– ventilation
Picture 2:
[Bei] Gefahr alle Schieber schließen – Knöpfe andrehen
–– In a dangerous situation: close all sliders – ([start to] turn)/(fasten) all buttons
Picture 3:
B[ei] künstlicher Belüftung – Hebel nach oben
–– If/When operating/under artificial ventilation – lever to the top
Picture 4:
............... die Schieber schließen (Maybe Gefahr alle ?)
–– close the sliders (When in danger close all sliders)
(too bad, or worse, to make out anything at the start. Maybe with a better picture? There is a second line.)