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In the late 20s Junkers built the G38 airliner, an advanced design for a long range luxury people carrier, a sort of dieselpunk Boieng 747 ancestor.
Junkers developed a Bomber version, called the K51, that for obvious reasons couldn't be built in Germany.
This was sold to Japan, were it was built in small numbers as the Mitsubishi Type 92 heavy Bomber, later called Ki20.
These were later reengined, like the German G38s with Jumo 204 diesel engines, giving extended range.
Slow and ugly, they made up for that with long range and a heavy bombload.

very much an early 30s design, this could have been, if Junkers had built it after 1934 for the LW, the bomber that gave the Germans a taste for heavy bombers, allowing them to conduct operational tests and maybe paving the way for the Do19 or the Ju89.
Those built could serve in WW2, as night bombers first, then as long range MPA and as tranports.
http://en.wikipedia.org/wiki/Mitsubishi_Ki-20

Mitsubishi_Ki-20.jpg
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