- OPEN TUBE COLUMN
- OPEN TUBE REACTOR
- OPEN TUBERCULOSIS
- OPEN TUBULAR COLUMN
- OPEN TUCK
- OPEN TURBINE CHAMBER
- OPEN TWINE BRAID
- OPEN TWO INTERPRETATIONS
- OPEN TWO SEA MARKS
- OPEN TYPE APPARATUS CIRCULATION LIQUOR
- OPEN TYPE BOILING MACHINE
- OPEN TYPE BOILING MACHINE WARP
- OPEN TYPE BOILING VAT
- OPEN TYPE BOILING VAT WARP
- OPEN TYPE COMPRESSOR
- OPEN TYPE COOLER
- OPEN TYPE MACHINE
- OPEN TYPE STEEL
- OPEN TYPE SWITCH
- OPEN TYPE SYSTEM
- OPEN UMBILICUS
- OPEN UNDERFLOOR TOWLINE
- OPEN UNEMPLOYED
- OPEN UNEMPLOYMENT
- OPEN UNION
- OPEN UNION SHOP
- OPEN UNIT
- OPEN UNIVERSE
- OPEN UNIVERSITY
- OPEN UNIVERSITY UNITED KINGDOM GREAT BRITAIN NORTHERN IRELAND
- OPEN UNRESTRICTED ACCESS
- OPEN UNRESTRICTED MARKET
- OPEN UP
- OPEN UP ACT
- OPEN UP APERTURE
- OPEN UP BUDGET CONSULTATION PROCESS
- OPEN UP CHANNELS TRADE
- OPEN UP COURT
- OPEN UP GUN
- OPEN UP INSERT
- OPEN UP JUDGMENT