PATENT 5224 of 1966
Improvements In and Relating To Drive Mechanisms

This appears to be the first patent covering the renowned �Greenfield Drive� �
a clever mechanical system � using belt drive to friction plates that gave
variable-speed, instant forward and reverse.

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Attachments
patent_5224_66.pdf (485.17 KB, 5 downloads)
PATENT 5224 of 1966 Improvements In and Relating To Drive Mechanisms.