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2. Wing Enterprises - Wikipedia

   en.wikipedia.org/wiki/Wing_Enterprises

   Wing Enterprises is an American company headquartered in Springville, Utah company, the largest American manufacturer of ladders as of 2005. [1] The company produces the Little Giant Ladder System, a convertible aluminium ladder system.

3. Fourth, fifth, and sixth derivatives of position - Wikipedia

   en.wikipedia.org/wiki/Fourth,_fifth,_and_sixth...

   Snap, [6] or jounce, [2] is the fourth derivative of the position vector with respect to time, or the rate of change of the jerk with respect to time. [4] Equivalently, it is the second derivative of acceleration or the third derivative of velocity, and is defined by any of the following equivalent expressions: = ȷ = = =.

4. Four-velocity - Wikipedia

   en.wikipedia.org/wiki/Four-velocity

   The four-velocity is the rate of change of four-position with respect to the proper time along the curve. The velocity, in contrast, is the rate of change of the position in (three-dimensional) space of the object, as seen by an observer, with respect to the observer's time.

5. AOL Mail

   mail.aol.com

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

6. Festiniog Railway 0-4-0TT - Wikipedia

   en.wikipedia.org/wiki/Festiniog_Railway_0-4-0TT

   The Ffestiniog Railway 0-4-0T+T were six 0-4-0T+T steam locomotives built by George England and Co. for the Ffestiniog Railway between 1863 and 1867. [1] [2] The locomotives were built to two designs: the first four were originally side tank locomotives and are collectively known as the Small England class; the final two locomotives were delivered with saddle tanks and are known as the Large ...

7. Variometer - Wikipedia

   en.wikipedia.org/wiki/Variometer

   [4] As Reichmann explained, a "Netto variometer shows the climb and sink of airmass (not of the sailplane!)...In order to achieve a 'net' indication, the always present polar sink of the sailplane must be 'compensated out' of the indication. To do this, one makes use of the fact that above the speed for best glide the polar sink speed of the ...