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Diagram of a 10k Bulldog Landing Gear Jack for Gear Replacement
Patent US6926261 - Trailer tongue jack - Google Patents
Patent US7494154 - Powered maneuverable and retractable trailer jack
Tongue Jacks - Repair Parts | Dutton-Lainson Company
Instructions for Disassembling a 12,000 lb Bulldog Jack | etrailer.com
Wiring Diagram for the Replacement Electric Jack Switch with Harness