[Milsurplus] BC-375: Unusual TU-10 Tuning Unit

[Mike Hanz]

Not at all.  They were used in many of the 14 volt aircraft in 
1936-1940, including the B-17.  :-)

David Stinson wrote:

>I bow to Richard's greater knowledge of 
>this earlier set.  191s are for ground pounders ;-).
>