Category:Sikorsky S-21

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English: Sikorsky S-21
Sikorsky Russky Vityaz 
Sikorsky Russky Vityaz (Le Grand).jpg
Wikipedia-logo-v2.svg Wikipedia
Subclass ofbiplane
Operator
Developer
First flight26 May 1913
Service entry1913
Authority control
Wikidata
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Pages in category "Sikorsky S-21"

This category contains only the following page.

Media in category "Sikorsky S-21"

The following 6 files are in this category, out of 6 total.