All-purpose gas mask lets wearer talk

Title (Dublin Core): All-purpose gas mask lets wearer talk
Subject (Dublin Core): en Technology; en Chemical warfare
Article Title and/or Image Caption (Dublin Core): All-purpose gas mask lets wearer talk
Language (Dublin Core): eng
Date Issued (Dublin Core): 1923-07
Is Part Of (Dublin Core): Popular Mechanics, v. 40, n. 1, 1923
pages (Bibliographic Ontology): 98
Rights (Dublin Core): public domain
Source (Dublin Core): google books
Archived by (Dublin Core): Marco Bortolami; Marco Bortolami (editor)