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| Попхем (a means of ground-to-air communication, introduced towards the end of WWI; their use was principally by the infantry, as an alternative to the 12' x 1' "ground strips" used by the artillery to make up letters and symbols) | |||
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| Попхем (a means of ground-to-air communication, introduced towards the end of WWI; their use was principally by the infantry, as an alternative to the 12' x 1' "ground strips" used by the artillery to make up letters and symbols) | |||