Old Calculator Web Museum Documentation Archive
Friden EC-130/EC-132 Service Letters #1(7/21/1964) through #35(6/3/1968)
These documents are scans of original Friden Service Letters. These
letters were used to communicate critical service information to field
and depot service personnel. There is a lot of interesting information
in these service letters. Most notable is Service Letter #18, dated
April 11, 1966, explaining the changeover from the initial "Four Counter"
versions of the EC-130 calculator at Serial Number 8501, to the "Three
Counter" design. Initially, these documents were entitled
"Electronic Calculator 130 Service Letter". At Service Letter #15, dated
August 16, 1965, the title was changed to "Electronic Calculator Service
Letter", omitting the "130" model designation, because by this time,
the Friden EC-132 follow-on
to the Friden EC-130 had
been introduced, and the service letters were then issued for both
calculators. Also note that the modernized Friden logo began being used
on Service Letter #33, dated April 25, 1968.
Friden 130/132 Service Letters, #1 to #35
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