Talk with a Minnesota licensed attorney. In addition to the potential workers compensation and employment claims, there may be claims against the manufacturer of the box stapler and if made by a different company, the electric eye. Good luck to you. Definitely speak with an attorney though, as the statutes of limitation may be different for your various claims.
Did you know of the dangerous condition before stepping onto the patio? Did the landlord? It depends on knowlege of the dangerous condition. I suggest speaking with an attorney in your state.
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Check with the business/parking lot owner. Find out if there is a surveillance camera, and arrange to obtain a copy. In any event, auto insurance should cover the claim.