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2. Lift chair - Wikipedia

   en.wikipedia.org/wiki/Lift_chair

   Lift chairs at Tampa Lift Chair Showroom. Lift chairs, also known as lift recliners or riser armchairs, are chairs that feature a powered lifting mechanism that pushes the entire chair up from its base and so assists the user to a standing position. In the United States, lift chairs qualify as durable medical equipment under Medicare Part B. [1]

3. Wheelchair cushion - Wikipedia

   en.wikipedia.org/wiki/Wheelchair_cushion

   Wheelchair cushions are cushions specifically designed to provide comfort and protection against injury for wheelchair users. They also aid in properly positioning the user in the correct posture. Wheelchair users are at great risk for pressure sores. [1] A number of factors are included in the formation of these ulcers including:

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5. Newton's law of cooling - Wikipedia

   en.wikipedia.org/wiki/Newton's_law_of_cooling

   The statement of Newton's law used in the heat transfer literature puts into mathematics the idea that the rate of heat loss of a body is proportional to the difference in temperatures between the body and its surroundings. For a temperature-independent heat transfer coefficient, the statement is:

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8. Gas lift chair - Wikipedia

   en.wikipedia.org/wiki/Gas_lift_chair

   A gas lift chair is a form of office chair that allows the user to modify their height in relation to the height of a desk, leading to an increase in comfort and ergonomic benefit. A patent describing a common configuration of a gas lift cylinder by John Wang, published 20 May 1989.

9. Self-regulating heater - Wikipedia

   en.wikipedia.org/wiki/Self-regulating_heater

   The heat output of any electrical heating element can be regulated by regulating the electrical power input. PTC heating elements also can be regulated indirectly. For example, a PTC heating element with a sharp change in resistance at a particular temperature can be fitted with a constant voltage source and a variable-speed fan.