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2. Street elbow - Wikipedia

   en.wikipedia.org/wiki/Street_elbow

   Street elbows are available with bend angles of 90°, 45°, and 22.5°. They can be used in many plumbing applications, including water supply, drainage, sewers, vents, central vacuum systems, compressed air and gas lines, heating and air conditioning, sump pump drains, and other locations where plumbing fittings would be used to join sections of pipe.

3. List of the United States Army fire control and sighting ...

   en.wikipedia.org/wiki/List_of_the_United_States...

   This is a list of United States Army fire control, and sighting material by supply catalog designation, or Standard Nomenclature List (SNL) group "F".The United States Army Ordnance Corps Supply Catalog used an alpha-numeric nomenclature system from about the mid-1920s to about 1958.

4. Atmospheric vacuum breaker - Wikipedia

   en.wikipedia.org/wiki/Atmospheric_vacuum_breaker

   It is usually constructed of brass and resembles a 90-degree elbow with a hood on its top to allow air to enter the water system if a siphon attempts to form. Inside this elbow is a poppet valve that is held "up" by the water pressure found in the system, closing the air entrance to the device. If the pressure in the "upstream side" is reduced ...

5. Experts Say Weight Lifting Is The Fountain Of Youth. Here's ...

   www.aol.com/lifestyle/experts-weight-lifting...

   Hinge forward at waist, keeping elbows by sides and bent at 90 degrees. Maintain an open chest by engaging the shoulder blades. Extend the weights back by straightening arms, then return to the ...

6. 5 Strength Workouts Men Should Do Every Week To Stay Fit - AOL

   www.aol.com/5-strength-workouts-men-every...

   Keep your chest high and elbows up and squeezed together throughout. A2) Dips, Sets: 4, Reps: 6 Get on a dip bar, keep your chest out, and lower yourself until your elbows make a 90-degree angle.

7. Piping and plumbing fitting - Wikipedia

   en.wikipedia.org/wiki/Piping_and_plumbing_fitting

   This naming convention applies to other plumbing elbows, such as: - "88 degree elbow" = 92 degrees on a protractor. Visualise bending the left end of the pipe up 88 degrees. Now turn the piece of pipe around so the horizontal piece of pipe is in line with the zero degrees line on the protractor. The protractor will read 92 degrees.