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RSC |
Rigid Steel Container |
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RT |
Route |
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RTAPS |
Rural Time and Attendance System |
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S/SIS |
Sales/Service Information System |
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SAM |
Space Available Mail |
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SBM |
Stamps by Mail |
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SCF |
Sectional Center Facility |
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SD |
Special Delivery |
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SD |
Side |
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SDO |
stamp distribution office |
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SHR |
Shore |
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SIS |
Short-Interval Scheduler |
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SLP |
Slip |
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SOP |
Standard Operating Procedures |
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SOTN |
Socked On The Nose (stamp cancellation) |
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SPBS |
small parcel and bundle sorter |
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SPC |
Space |
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SPLSM |
single-position letter sorting machine |
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SPLY |
same period last year |
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SPO |
serving post office |
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SPR |
Small Parcels and Rolls |
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SSIS |
Schedules and Schemes Information System |
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SSM |
Sack Sorting Machine |
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SSPC |
Self-Service Postal Center |
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SSPU |
Self Service Postal Unit |
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