Reference Material Links:

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https://patents.google.com/patent/US2060688A/en?q=rigging&q=wagon&oq=rigging+wagon

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//docs.google.com/presentation/d/1iplrogjqWbII-_fUOvxD9z-p-cH_PmYd9XvOOIemd_c/edit#slide=id.p