Keywords: aviation aircraft airplane bomber military aviation militaryaviation prototype flight test flighttest united states air force unitedstatesairforce us air force usairforce usaf glenn l. martin company glennlmartincompany martin company martincompany martin martin xb-51 martinxb51 xb-51 xb51 martin b-51 martinb51 b-51 b51 general electric generalelectric ge general electric j47 generalelectricj47 ge j47 gej47 j47 general electric j47-ge-13 generalelectricj47ge13 j47-ge-13 j47ge13 trijet 46-685 46685 46-0685 460685 martin p4m mercator martinp4mmercator martin p4m martinp4m martin mercator martinmercator p4m mercator blackandwhite monochrome black and white NARA B26514..9 Mar 50 NARA B26514..9 Mar 50 |