So much for my memory..
Um... ERA were the people who built the "Project 13" machines during
WW II. The 1101 used a drum, and built the follow on 11xx machines
in the Twin Cites. ref "A Few Good Men From Univac" "From Dits To
Bits", etc.
should be (from the URL about the ERA Book):
In the fall of 1946, ERA received its first major contract from the Office of
Naval Research to compile a report on ?High Speed Computing Devices?. This
report, which became the definitive study of the infant state of computing, was
later published in book form by McGraw Hill. During this project, ERA personnel
was given access to classified government reports and worked with computer
pioneers John Mauchly and J. Presper Eckert, inventors of the ENIAC, and John
von Neumann, of Princeton University's Institute for Advanced Study.
ERA was dependent on government funded cost-plus--fixed-fee contracts. In August
1947, it began work for the Navy on Task 13 - a project to design a general
all-purpose stored-program computer. During this project ERA developed the first
magnetic storage drum; the technology upon which the next two generations of
computers was based. In October, 1950, ERA completed work on the Atlas computer
- America's first electronic stored-program computer. The Atlas with its 2,700
vacuum tubes was capable of running twenty-four hours a day with only 10% of the
time allotted for maintenance.
--
The commercial verison of "Atlas" is the 1101