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2. Differential screw - Wikipedia

   en.wikipedia.org/wiki/Differential_screw

   Differential screw leveling feet, drawing by Joshua Rose, 1887. A differential screw is a mechanism used for making small, precise adjustments to the spacing between two objects (such as in focusing a microscope, [2] moving the anvils of a micrometer, [3][4] or positioning optics [5]). A differential screw uses a spindle with two screw threads ...

3. The best canes for 2024, according to nurses ... - AOL

   www.aol.com/lifestyle/best-cane-151849845.html

   Stay steady on your feet and walk with confidence — these ... Drive Medical RTL10365-ADJ Adjustable Lightweight Folding Cane with Seat ... $26 at Walmart $32 at Amazon $40 at Lowe's. See more ...

4. Philadelphia rod - Wikipedia

   en.wikipedia.org/wiki/Philadelphia_rod

   A Philadelphia rod is a level staff used in surveying. The rod is used in levelling procedures to determine elevations and is read using a level. A Philadelphia rod consists of two sliding sections graduated in hundredths of a foot. On the front of the rod the graduation increasing from zero at the bottom. On the back of the rod the graduation ...

5. Level (optical instrument) - Wikipedia

   en.wikipedia.org/wiki/Level_(optical_instrument)

   A level is an optical instrument used to establish or verify points in the same horizontal plane in a process known as levelling. It is used in conjunction with a levelling staff to establish the relative height or levels (the vertical separation) of objects or marks. It is widely used in surveying and construction to measure height differences ...

6. The best walker for seniors of 2024 according to therapists ...

   www.aol.com/lifestyle/best-walker-seniors...

   $34 at Amazon $34 at Walmart $34 at Lowe's. See more options. ... "Adjustable handle height, easy fold-up and ergonomic squeeze brakes makes this a well-designed tool for anyone with mobility ...

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