Gas helmets used in airship helium compartments

Title (Dublin Core): Gas helmets used in airship helium compartments
Subject (Dublin Core): en Technology; en Personal protection (helmets)
Article Title and/or Image Caption (Dublin Core): Gas helmets used in airship helium compartments
Language (Dublin Core): eng
Temporal Coverage (Dublin Core): [–][+]1932
Date Issued (Dublin Core): 1932-05
Is Part Of (Dublin Core): Popular Mechanics, v. 57, n. 5, 1932
pages (Bibliographic Ontology): 815
Rights (Dublin Core): Public domain
Source (Dublin Core): Google Books
Archived by (Dublin Core): Alessandro Barcaro; Marco Bortolami (editor)