File:Keystone K-47C Sign Carrier Aero Digest November 1928.jpg
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![File:Keystone K-47C Sign Carrier Aero Digest November 1928.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Keystone_K-47C_Sign_Carrier_Aero_Digest_November_1928.jpg/800px-Keystone_K-47C_Sign_Carrier_Aero_Digest_November_1928.jpg?20180626122009)
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