What was this used on then??

Title says it all

http://www.milweb.net/classifieds/large_image.php?ad=53078&cat=8

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By: MerlinPete - 29th September 2010 at 22:29

They were used as an airborne APU in US aircraft in WW2.
I once heard that they were used in the B-29, but the only B-29 APUs I have seen use a V-twin Ranger.
I don`t know what kind of military vehicle he expects to get in exchange for it though!

Pete