Researchr is a web site for finding, collecting, sharing, and reviewing scientific publications, for researchers by researchers.
Sign up for an account to create a profile with publication list, tag and review your related work, and share bibliographies with your co-authors.
Lars Heide. From Invention to Production: The Development of Punched-card Machines by F. R. Bull and K. A. Knutsen 1918-1930. IEEE Annals of the History of Computing, 13(3):261-272, 1991. [doi]
Abstract is missing.