The Elecon double reduction worm gear box gives a minimum of 75:1 and a maximum of 4900:1 ratio to meet the requirement of slow moving machinery.
product link:https://www.desminunited.com/images/elecon/double-reduction.pdf

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seen from United States
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seen from Germany
seen from China

seen from United States
seen from China

seen from Malaysia

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seen from Russia
The Elecon double reduction worm gear box gives a minimum of 75:1 and a maximum of 4900:1 ratio to meet the requirement of slow moving machinery.
product link:https://www.desminunited.com/images/elecon/double-reduction.pdf