4733, Commonwealth Edison Company, Chicago, Illinois, Economizer failure
name: label: Collection Creator
content: Hartford Steam Boiler Inspection and Insurance Company
setName: label: See more items in
content: Hartford Steam Boiler Inspection and Insurance Company Records
unitdate: label: Date
content: 1947
container: label: Container
content: Box 1, Folder 21
dataSource: label: Archival Repository
content: Archives Center, National Museum of American History
objectType: label: Type
content: Archival materials