[GreenKeys] Mystery stunt box?

[Jim Haynes]

I don't know if the machine in question is aviation related, but FPK
is the location identifier of Fitch H. Beach airport near Charlotte,
Michigan.  It seems strange that such a small airport even has a
3-letter location identifier.  Much less that it would have some sort
of Teletype operation.

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 	"Ya can argue all ya wanna, but it's dif'rent than it was."
 	"No it ain't! No it ain't!  But ya gotta know the territory."
 		Meredith Willson, The Music Man