TheCodeBreakers
for Hebern in 1931, when the Navy purchased 31 machines for $54,480.
These were not experimental machines, but were issued to the more
important flag officers as the top cryptographic system in the United
States Navy. In 1934, Hebern, who was continually trying to improve his
machines, submitted one that proved a complete failure. The officer who
had dealt most with him, Safford, was on sea duty, and some Navy man
who did not know Hebern sent him an abrupt and discourteous letter,
discontinuing business with him. As Safford later put it, "They pulled the
rug out from under Hebern and were not even polite about it."
That virtually ended Hebern's chances, for although his machines
were still in service, when they wore out in 1936 after carrying heavy
loads of traffic they were replaced by another, non-Hebern cryptographic
system. Interestingly, the Hebern machines themselves were renovated
and sent to shore stations, where some remained in use until 1942. Two
annaabi.ee 
