Helicopter stays in air for fifteen minutes

Title (Dublin Core): Helicopter stays in air for fifteen minutes
Subject (Dublin Core): en Airplanes and Zeppelins; en Technology
Article Title and/or Image Caption (Dublin Core): Helicopter stays in air for fifteen minutes
Language (Dublin Core): eng
Date Issued (Dublin Core): 1923-09
Is Part Of (Dublin Core): Popular Mechanics, v. 40, n. 3, 1923
pages (Bibliographic Ontology): 402
Rights (Dublin Core): public domain
Source (Dublin Core): google books
References (Dublin Core): helicopter
Archived by (Dublin Core): Marco Bortolami; Marco Bortolami (editor)
Spatial Coverage (Dublin Core): United Kingdom