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Unless you know that the clients' lawns are a specific type, it is most likely a mixture... I always buy the local mixture for overseeding, because certain grasses do better in certain spots, than others...
I've already started applying fertilizer once the weather cooled down and I didn't bother with Phosphorus either... so getting the seed into the turf and germinating is job one... dethatching only makes that job more difficult...
Perhaps that is a useful reason for aerating at 1" depth... it punches through the living thatch and allows a seed bed for grass that won't bury the crowns 3" deep when the hole closes up...
It won't do much for rootzone compaction though...
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Well reasoned rational thought is the ONLY way to prove or disprove anything, rather than the foolish insults of those incapable of putting together the thought processes necessary to accomplish conclusions... 
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