being a mechanical engineering student, l would like to have all the possible information about the hardware companies. so if it possible to get the pictures which gives the information about the infrastruture, housing facilities etc . pleas.................

You must check in with security beforehand. And should call first. That makes it alot easier to view.

Most plants will not allow photography inside their premises. You may search the net for factory photographs that are sometimes used in newspapers and business magazines.
Getting photographs of entry gates is easier. As also photographs of the townships and other civic amenities. Just get in touch with people living near these locations and they would help you.

u wont be allowed any sort of photography in any industrial unit.
i suggest that if u know the location(city,town,industrial zone) of the plants,try using google earth. atleast u ll get an exterior view.