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Figure 3 Summary of USPS Equipment Upgrades

Multi-position Letter Sorting Machine (MPLSM)

1973 -

Engineering Data Isolation Technique (EDIT) - An electronic modification to the ZMT which allowed keyed data to be monitored for accuracy.

1974 -

Automatic Density Analysis Profile Technique (ADPT) -- An Upgrade that enabled automatic tabulation of MPLSM sweepside BIN densities.

1976 -

Electronic Sort Processor (ESP) - A modification to MPLSMs which replaced mechanical code setting with electronic code setting to provide more accuracy, reduce maintenance costs, and reduce noise.

1978 -

Micro-Key - An upgrade to the ZMT which allowed the first digit of a carrier route number to be locked in each time an operator keyed an incoming secondary distribution.

1981 - 1982 -

ZIP Data Logger (ZDL)

Electronic ZIP Retrofit (EZR)-- A modification to MPLSMs to allow four digit keying of ZIP+4 Codes.

1969 -

ZIP Mail Translator

(ZMT) - Converted MPLSMs from simultaneous

operators

keying (cordal) to sequential then could be translated by

keying.

ZIP Codes keyed by

the

ZMT into BIN

assignments.

Facer Cancelers

1982 -

Micro Mark - A modification to Mark II Facer Cancelers to upgrade the electronics to Solid State circuitry.

Single Position Letter Sorting Machine (SPLSM)

1972 -

Automated Business Mail Processing System (ABMPS) - A modification to the Universal Business Machine (UBM) SPLSM to allow automated distribution of destinating Bar Coded Business Mail.

Flat Sorting Machine (FSM 775)

1984 -

Software Modification - An upgrade to provide Micro key capability on the FSM 775.

Source:

United States Postal Service

31a

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