Assorted instrument certificates
name: label: Collection Creator
content: Duffy, Harry A.
label: Collection Creator
content: Duffy, Duane A.
label: Collection Creator
content: Duffy, Glenn E.
setName: label: See more items in
content: Harry A. Duffy Papers
label: See more items in
content: Harry A. Duffy Papers / Series 4: Certification and Certificate Files
unitdate: label: Date
content: 1913-1999, undated
container: label: Container
content: Box 4, Folder 11
dataSource: label: Archival Repository
content: Archives Center, National Museum of American History
objectType: label: Type
content: Archival materials