I am looking for refillable pressurized air spray cans.  You've
probably seen the disposible versions usually used for dusting things
like keyboards (ex. 
http://www.falconsafety.com/dust_off/products/prod_detail.asp?id=64 
or  http://store.yahoo.com/webtronics/402a-400g.html).  However, I am
in a business where I would be using these a lot, and it's not
economical for me to buy disposible ones if I could find something
that is "rechargeable".  Small, portable electic or gas air
compressors don't really work -- they're too bulky and it's an extra
peice of major equipment my employees need to carry.  I'd really just
like to find something that is more can size, and can be recharged
when exhausted.  I don't even mind if it's the size of a small fire
extinguisher. 12-18 inches high is ok, again, as long as it's
reasonably small and can be recharged when exausted.  That way I can
recharge them at the end of the day, but send them out in the field
during the day for us.  The application is dusting inside small
grooves in cars and trucks, as well as blowing dust from small cracks,
under seats, etc.  That's why I thought something like thos aerosol
cans that you use to dusk keyboards might work. But because they're
disposable, they're not really economical for me to use on a daily
basis.

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Request for Question Clarification by pinkfreud-ga on 09 Feb 2006 15:14 PST

Would this product meet your needs?

http://www.buyonlinenow.com/viewproduct.asp?SKU=REARR6000

More info:

http://techrepublic.com.com/5100-1035-1044375.html

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Clarification of Question by mikeyrosenrosen-ga on 27 Feb 2006 10:14 PST

Yes, that's exactly what I was looking for, thanks!

I am delighted to have been able to help you find what you needed.
I've reposted the links below:

Buy Online Now: ReAir Refillable Duster
http://www.buyonlinenow.com/viewproduct.asp?SKU=REARR6000

More info:

Tech Republic: Save money with refillable compressed air canisters
http://techrepublic.com.com/5100-1035-1044375.html

I am surprised that there aren't more products like this one, but
quite a bit of searching turned up only the ReAir Refillable Duster.
This was the Google search string that led me to the answer:

Google Web Search:"compressed OR pressurized air" refillable OR reusable
://www.google.com/search?hl=en&q=%22compressed+OR+pressurized+air%22+refillable+OR+reusable

Best regards,
pinkfreud