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Ceiling fans were proven to have a more significant effect on the droplet and airborne transmission when the coughing infected person is located directly under the ceiling fan. Ceiling fans offer better protection from cough exposure for people located closer to the fan center, where the directed airflow changing particle trajectory downward to ...
Window and central air conditioning in the 1960s caused many companies to discontinue production of fans, [12] but in the mid-1970s, with an increasing awareness of the cost of electricity and the amount of energy used to heat and cool homes, turn-of-the-century styled ceiling fans became popular again as both decorative and energy-efficient.
The leg extension machine was created by American fitness guru Jack LaLanne in the 1950s. [3] The first prototype is recognized to have been made under Gustav Zander, but labeled the machine as a form of “mechanotherapy” along with other machines that extended the knee and ankle. [3] The machine was made to target the quadriceps.
Yellow NEMA 5-15 extension cord NEMA-1 extension cord, common in the United States Extension cord reel (Germany). An extension cord (US), extension cable, power extender, drop cord, or extension lead (UK) is a length of flexible electrical power cable (flex) with a plug on one end and one or more sockets on the other end (usually of the same type as the plug).
In anatomy, extension is a movement of a joint that increases the angle between two bones or body surfaces at a joint. Extension usually results in straightening of the bones or body surfaces involved.
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