The phrase "...solely by the effort of the client." suggests that you cannot hire any other agent to represent you in obtaining a licensee or purchaser of your invention. The clear intent of the phrase is to permit the client to "personally" locate a potential client, without obligation to IRI -- but, not through any other agent.
I realize that this is not what you want to read, however, I am trying to objectively interpret the legal text that you provide, and that is my interpretation. There may be some other way out of the deal -- maybe if you can show that IRI does nothing with your invention over the next six months or so, that this would demonstrate a lack of good faith effort, and thus grounds to rescind the agreement as either a misrepresentation or a mistake.
Hope this helps.
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