Radio outfit combined with airman's oxygen helmet

Title (Dublin Core): Radio outfit combined with airman's oxygen helmet
Subject (Dublin Core): en Technology; en Airplanes and Zeppelins; en Personal protection (helmets)
Article Title and/or Image Caption (Dublin Core): Radio outfit combined with airman's oxygen helmet
Language (Dublin Core): eng
Date Issued (Dublin Core): 1922-06
Is Part Of (Dublin Core): Popular Mechanics, v. 37, n. 6, 1922
pages (Bibliographic Ontology): 880
Rights (Dublin Core): public domain
Source (Dublin Core): google books
Archived by (Dublin Core): Marco Bortolami; Marco Bortolami (editor)