TT is telegraph transfer and OD is on demand.
what is difference between NB & OD in pipe size
In eye prescriptions, "OS" refers to the left eye and "OD" refers to the right eye.
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An ophthalmologist is trained as a physician and has gone to medical school, which makes them an M.D. (Doctor of Medicine) or a D.O. (Doctor of Osteopathic Medicine). An optometrist, on the other hand, is an O.D. (Doctor of Optometry or Occulis Doctor).
The order of the letters. For a more definitive answer, you'd need to give us some kind of context.
Try this site:* http://arthistory.about.com/od/movements/f/eramoveperiod.htm
NB = inside diameter of the tube. OD = outside diameter of the tube.
There is no corelation between a cylinders ID to OD.
The bill must go through an extra committee in the House, the Rules Committee.
around £200,000 a year
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