While light switches need you to physically flip the switch and pressure switches use air to operate, your contactor is triggered by a solenoid pulling on a small plunger (the button).
http://www.shcetelec.com/ac-co....ntactor/air-conditio

The brake booster is a device used to amplify the force applied on the brake pedal when transferring that force to the brake master cylinder. Brake systems that have them are often called “power brakes.”
http://www.rexproauto.com/

You also want happy customers that refer their friends and contacts, not upset customers who call because of a torn up yard and have negative lasting memory of your work.
http://www.polytechmachine.com..../plastic-pipe-machin

Baby Jogger got its start in 1984 with the first jogging stroller solution for active parents with a toddler! However, despite the brand name, most of Baby Jogger's many current stroller offerings are not intended for use while jogging or running.
http://www.orsutstroller.com/b....aby-carrier/baby-jog

Since most kids these days are glued to electronics and unhealthy processed foods, it’s easy to see how these sedentary lifestyles offer little to no physical benefits. When you take your child’s iPad away and bring them to a kids indoor playground,
http://www.kangleplayground.com/indoor-playground/