what is chipboard made of and how is it made?
I have a pair of dockers pants made in Cambodia, a white shirt made in Thailand, and my slippers were made in China. They are made everywhere.
how was Indus seal made
ceramic is made of pure heat over 100c and bits of gravel and stone its ,made in a large stone oven called kiln. cement is mostly made of a mixture of elements that are found in natural materials.
Who sells anvil loppers made by dunston industries
yes
Manhole covers are used for many things. Manhole covers are used to cover up holes in the ground where sewage can be found in order to protect people.
If they were rectangular they could fall down the manhole.
Get a crow bar and you can easily lift it out. Then you can do whatever you want in the manhole. Also manhole covers scrap at a junk yard for about 10 bucks.
"Manhole covers" are simply spelled "manhole covers". The reason most of them are perfectly round is that a round cover cannot slip down into a hole that is even just slightly smaller than the cover (as can oblongs or squares).
If they were made of wood they would rot and have to be replaced frequently. The metals used are also inexpensive.
steel
Round manhole covers are generally used over square manholes because they cannot fall through the manhole openings. There is a chance that if square manhole covers are used they can be turned at an angle and fall through the manhole opening. Round manhole covers can be moved more easily as well.
Paco Corporation manufactures steel, aluminum, and stainless steel manhole covers. There are a number of manufactures that make fiberglass manhole covers. 9945 S Industrial Dr. Bridgeview, IL 60455 Tel: 708-430-2424 Fax: 708-430-0056 http://www.pacograting.com
The round manhole cannot fall into the hole no matter which way you turn it.
1) That way, they can easily be moved, by rolling them. 2) They can't accidentally fall into the manhole.
They are called man holes, or manhole covers.