. Title page 9 cylinder, type B2, Gnome & Le Rhone engine co., June 1917 Gnome Le Rhone 'Monosoupape' (single valve) B2 9 cylinder rotary engine of WW1. See other images from this source in Gnome Monosoupape aircraft engine manual . 1917 or earlier 715 Gnome Monosoupape title page

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Photo credit: © History and Art Collection / Alamy / Afripics
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