electromagnets
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To create my invention, i had to go to a scrap metal yard.
scrap metal is not biodegradable in the most common sense of the word. Scrap metal should be recycled at your nearest scrap yard. By scrapping copper aluminum and iron scrap metal, depending on the current prices, you could sell it for a hefty amount of money. currently copper is 3 dollars per pound.
No
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.
application of hydraulic crane