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Donald Wallace (Wally) Gordon (4 February 1932 – 11 April 2016) was an American gymnast and inventor who is notable for inventing the first landing mats, incline mats, octagons and all the other foam shapes that currently fill gymnastic schools. [1]
Springfree Trampoline is a company that manufactures recreational trampoline products and accessories. The design was created by Keith Vivian Alexander , a professor in the Mechanical Engineering Department at the University of Canterbury in Christchurch , New Zealand .
Using digging bars to move rocks A girl and a man dig a hole with a heavy digging bar to plant a tree. Common uses of digging bars include breaking up clay, concrete, frozen ground, and other hard materials, moving or breaking up tree roots and obstacles, and making holes in the ground for fence posts.
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The law of holes, or the first law of holes, is an adage which states: "If you find yourself in a hole, stop digging." It is used as a metaphor, warning that when in an untenable position, it is best to stop making the situation worse. [1] [2] The second law of holes is commonly known as: "When you stop digging, you are still in a hole." [3]
A mattock (/ ˈ m æ t ə k /) is a hand tool used for digging, prying, and chopping. Similar to the pickaxe, it has a long handle and a stout head which combines either a vertical axe blade with a horizontal adze (cutter mattock), or a pick and an adze (pick mattock).