Author
Philadelphia Record
11
Bell, D. Sargent, 1876-194-
2
Frain, Hummel La Rue
2
Heebner & Sons (Lansdale, Pa.)
2
Knight, Charles, 1791-1873
2
Maxson, John W., Jr
2
Newcomen Society of the United States
2
United States. Bureau of Labor Statistics
2
A.B. Farquhar
1
American Society of Mechanical Engineers
1
Ancona Print Works
1
Arguto Oilless Bearing Company
1
Armstrong Melchior (Dessau County)
1
Bateman Bros., Inc. (Philadelphia)
1
Battin, Joseph
1
Baugh & Sons (Philadelphia)
1
Bedini, Silvio A.
1
Birkinbine, Henry P. N.
1
Blake, (Geo. F.) Manufacturing Co
1
Boss, M. Kenneth
1
C.H. Bidwell Thresher Co
1
Casson, Herbert Newton, 1869-
1
Champion Blower and Forge Co. (Lancaster, Pa.)
1
Chandler, T. P. 1807-1886
1
Charles Beseler Co
1
Cheney, Lynne V.
1
Conolly, John, 1794-1866
1
Dawson, Andrew, 1948-
1
Deering Harvester Company
1
Evans, W. Duane 1909-
1
Ferguson, Eugene S.
1
Frick Company (Engineers : Waynesboro, Pa.)
1
Frick Company (Waynesboro, Pa.)
1
Green, J.E. (Chester, Pa.), photographer
1
Gruber, Harry, photographer
1
H. B. Smith Machine Co. (Philadelphia)
1
Hall, Henry, 1848-1920
1
Harnischfeger, Henry
1
Hotchkiss, Willard E.
1
Howland, Henry C., photographer
1
Hutchinson, William T. 1895-1976
1
Industrial Workers of the World
1
Ingersoll-Rand Company
1
International Film Service, photographer
1
James McKay Co., Inc. (Pittsburgh, Pa.)
1
James McKay Company, Inc. (Pittsburgh, Pa.)
1
Journal of Progress Company
1
Loomis, A. W.
1
Martin, Henry (Lancaster, Pa.)
1
Maryland farmer
1
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