PROBST & PHILIPPON'S COLLAPISBLE LIFEBUOY

Joachim Schult trans Inge Moore, Curious Boating Inventions,Taplinger Publishing Co, 1974

201: With the life-suit unfolded and the helmet opened.

202: A man could even lie down and go to sleep in the collapsible lifebuoy by Probst & Philippon.

203: Alternatively, he could stand upright or sit down.