28 Bn CEF Signalling HQ in crater

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28th Battalion establishes a Signalling HQ and get into communication with aeroplanes. April 1917 - Vimy France. The method of communicating with aeroplanes is described here. 

Credit: Canada. Dept. of National Defence / Library and Archives Canada 
Restrictions on use: Nil
Copyright: Expired 
Copy negative PA-001096
Item no. (creator) O-1165
Other accession no. 1964-114 NPC
MIKAN no. 3521074