How many trees can a bulldozer take out in an hour?
It really depends on the size of the dozer! Are the trees mechantable? If so it would be a waste to put them in piles. If they are to small for sawlogs a big machine should be able to clear your acre in less than a day.
list of industries in jhajjar?
I don't know where are you located, but for sure the Director of Industries of the Jhajjar (Haryana) area can give you the most authentic information. Alternatively you may get in contact with a local industries association
Building plans for a mini dozer/crawler???
Sometimes you can find plans on Ebay.....