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Clearing leaves can wear you out. One of the most effective tools in the annual struggle of yard versus leaf is the backpack blower.
Gas-powered leaf blowers can register as high as 100 decibels at the source (the levels decrease with distance). Most electric models range from 59 to 70 decibels.
The leaf blower originated in 1947 as a backpack fogger apparatus, invented by Japanese-based Kyoritsu Noki Company. Kyoritsu followed that design with a backpack/blower/misting machine in 1955. in 1968, Kyoritsu applied for a patent on a backpack blower mister design, and in 1972 established themselves in the United States as Kioritz ...
There are two types of upright vacuums; dirty-air/direct fan (found mostly on commercial vacuums), or clean-air/fan-bypass (found on most of today's domestic vacuums). The older of the two designs, direct-fan cleaners have a large impeller (fan) mounted close to the suction opening, through which the dirt passes directly, before being blown ...
Vergence-accommodation conflict (VAC), also known as accommodation-vergence conflict, is a visual phenomenon that occurs when the brain receives mismatching cues between vergence and accommodation of the eye.