Out of curiosity, I contacted the U.S. Jack Company about this series of Screw Jacks. They purchased the tooling for the older series of hydraulic and screw jacks from Auto Specialties in 1988 when Auto Specialties closed. The older documentation had also been obtained in the transaction.
Unfortunately, in 2000, U.S. Jack Company had a massive fire at their plant and much of the archive documentation was lost for these jacks.
The only likely surviving paperwork is now probably in Military Parts Listings and manuals that may still be around.
David
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