Try these folks
http://www.theworldwar.org/s/110/new/index.aspx?sid=110&gid=1&pgid=1054
 
the National World War I Museum
 
Barbara Hass, retired librarian
 
In a message dated 11/3/2009 11:15:38 A.M. Mountain Standard Time, [log in to unmask] writes:
We have recently accepted into our collection an important WWI German Maxum Machine Gun.  Important because it is the machine gun captured by war hero, Alvin C. York.  We are planning the exhibit opening in Feb. 2010.  To my knowledge it is in the original condition.  It is in dire need of cleaning.  What is recomended for cleaning and preservation?  Thanks so much for your help!

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