25 Pats. 1858 - Ruhmkorff
name: label: Collection Author
content: Society for the History of Technology
label: Collection Author
content: Kranzberg, Melvin, Dr., 1917-1995
setName: label: See more items in
content: Society for the History of Technology Records
label: See more items in
content: Society for the History of Technology Records / Subgroup II: Technology and Culture Records / Series 8: Technology and Culture Editor / 8.8a: Correspondence (Robert Post, editor)
container: label: Container
content: Box 115 (Subgroup II)
dataSource: label: Archival Repository
content: Archives Center, National Museum of American History
objectType: label: Type
content: Archival materials