3M Megaphone
name: label: Collection Publisher
content: 3M Company
setName: label: See more items in
content: 3M Megaphone Collection
unitdate: label: Date
content: 1941
container: label: Container
content: Box 1, Folder 1
dataSource: label: Archival Repository
content: Archives Center, National Museum of American History
objectType: label: Type
content: Archival materials