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  Tanks
 Flame Throwers
 Poison Gas
 Tracer Bullets
 Air Traffic Control
 Depth Charges
 Hydrophones
 Aircraft Carriers
 Pilotless DRones
 Mobile X-Ray Machines
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  The Battle of the Somme was one of the largest battles of WWI. It was fought between July 1 and November 1, 1916.
