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2. French catheter scale - Wikipedia

   en.wikipedia.org/wiki/French_catheter_scale

   An increasing French size corresponds to a larger external diameter. This is contrary to Birmingham gauge, where an increasing gauge corresponds to a smaller diameter needle. The French size is a measure of the outer diameter of a catheter (not internal drainage channel, or inner diameter). So, for example, if a two-way catheter of 20 Fr is ...

3. Fluorescent-lamp formats - Wikipedia

   en.wikipedia.org/wiki/Fluorescent-lamp_formats

   For T2–T12 and T17, the number indicates the tube diameter in 1 ⁄ 8 inches, e.g. T2 → 2 ⁄ 8 in and T17 → 17 ⁄ 8 in. Whereas for T16 and T26–T38, the number indicates the approximate tube diameter in millimeters.

4. Feeding tube - Wikipedia

   en.wikipedia.org/wiki/Feeding_tube

   A gastric feeding tube (G-tube or "button") is a tube inserted through a small incision in the abdomen into the stomach and is used for long-term enteral nutrition. One type is the percutaneous endoscopic gastrostomy (PEG) tube which is placed endoscopically. The position of the endoscope can be visualized on the outside of the person's abdomen ...

5. Birmingham gauge - Wikipedia

   en.wikipedia.org/wiki/Birmingham_gauge

   Size steps between gauges range from 0.001 inches (0.025 mm) between high gauge numbers to 0.046 inches (1.2 mm) between the two lowest gauge numbers and do not correspond to a particular mathematical pattern, although for the most part the steps get smaller with increasing gauge number. [3]

6. List of vacuum tubes - Wikipedia

   en.wikipedia.org/wiki/List_of_vacuum_tubes

   1H4-G – Medium-mu triode, can be used as a power triode. Octal version of type 30, which is an upgraded version of type 01-A. "GT" version also available. 1H6-G – Octal version of type 1B5/25S. "GT" version also available. 1J5-G (950) – AF Power pentode; 1J6-G – Dual power triode, octal version of type 19. "GT" version also available.

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9. British Standard Pipe - Wikipedia

   en.wikipedia.org/wiki/British_Standard_Pipe

   the document number of the standard (e.g., ISO 7 or EN 10226) the symbol for the pipe thread type: G, external and internal parallel (ISO 228) R, external taper (ISO 7) Rp, internal parallel (ISO 7/1) Rc, internal taper (ISO 7) Rs, external parallel; the thread size; Threads are normally right-hand. For left-hand threads, the letters, LH, are ...