I am planning to establish a commercial venture, specifically that of
an indoor kids play center, in Maryland (in or near Howard
County/Baltimore County/Baltimore/Anne Arundel County/Montgomery
County) which will have a capacity for up to 300 children (ages 2-12)
at a one time playing and perhaps up to 700 people total (parents etc)
in the facility at peak times.

There appear to be lots of companies who make and supply play
equipment but I would like to identify those that supply only indoor
play equipment of the type I need. I have found a couple as below but
I would like to identify a larger list of capable companies who
manufacture this equipment so I can check their product and pricing I
believe there are some in the UK and probably more in the US but here
are the two I found:
http://www.playtec.co.uk/frames_indoor.shtml
http://www.internationalplayco.com/public.php?section_id=15&sub_section_id=34.