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Electric gates alone, however solid and imposing they may be, cannot guarantee a completely secure environment electric locks, are often needed to boost the locking effectiveness of the gate motors. Electric gates are recommended to be used in combination with other security features to install a full security system .
In 1954, Dee Horton and Lew Hewitt invented the first sliding automatic door. The automatic door used a mat actuator. In 1960, they co-founded Horton Automatics Inc and placed the first commercial automatic sliding door on the market. [5] With the invention of the Gunn diode, microwave motion detectors became common in automatic doors in the 1970s.
Aluminum fencing is used for both commercial and residential use. Aluminum fence is generally available preformed, in a wide variety of styles. It tends to be easy to clean, resists weathering and has low maintenance requirements. It can also be more cost-efficient than comparable materials, such as wrought iron and steel.
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Are preserved today two city gates: Puerta del Mar completed in 1710, and Puerta de Tierra built in 1732. Trinidad and Tobago: City Gate (Port of Spain), Port of Spain; Puerto Rico: In San Juan, a World Heritage Site, the Walls of the city had five gates. The main was the Puerta de San Juan, today preserved, built in 1635.
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