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Does anyone know when the Z drive was first sold? Volvo Penta introduced I/O's in the late 50's. (actually invented by a Mercury enployee who Carl Kiekhefer didn't take seroiusly!) Volvo came out with the DuoProp counter rotating system about ten years ago.
Here we see the whole thing in Italy in the 40's. Facinating.
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Trav
1969 1750 Spider
1971 1750 GTV
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