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http://www.lsainc.com/ is certainly one. http://www.lasertech.com/ is another. Actually, lasers have been around for quite some time. In certain instances, it provides a good connectivity solution where cabling cannot be accomplished due to some constraint.
I would suggest asking any of the vendors that you speak with for comparative literature between them and their competitors. This will give you an idea of not only who they view their competition to be, but also how they view themselves in relation to the competition. You should note that this is a line of sight transmission, so there can be no obstacles (including temporary ones like cranes).
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