You have to go back to 1971 for the last time we saw five different factories inside the top ten of a premier class race at five of the opening six rounds of the season. Back then, the likes of Paton, Linto, MV Agusta, Seeley, Koenig, BMW, Matchless, Norton, Husqvarna and Bultaco were challenging some of the more familiar of the modern era like Kawasaki, Yamaha and Suzuki.
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