Wenderoth, Lind & Ponack
Underwater breathing device
 An underwater breathing device substantially differing from known submerging apparatuses heavily armored and applicable for deep sea exploration. This invention device is characterized by structural simplicity and ease of operation. The device comprises a float, tubular members and a mask integrally united so as to enable a user to swim submerged close to the water surface while breathing air in and out directly to and from the atmosphere via said mask and said tubular members. 
B
B63C
inventional
Masayasu
Saito