Bound collection of Sinclair Refining Company "Sinclair Bulletins" (customer testimonials, product approvals, etc.) issued between 1919-1922 and three copies of a promotional brochure for the company's Four Brothers Quality Grease.

{ITEM #1} Two-hole punch manila paperback covers with exterior green cloth spine; cover edges bumped with chipping to corners; fraying at spine ends. Approx. 130 single-sided leaves; typescript-style text; sheets toned with some foxing and soiling. Comprised of company bulletins with customer testimonials as to Sinclair oil products; bulletins are in numerical order but are not consecutively numbered. First six leaves are alphabetical Index; Bulletin No. 1 dated June 10, 1919 with final bulletin dated 1/20/22. {ITEM #2} Second separate group of typescript Sinclair Bulletins but on green bordered company stationery consecutively numbered as MD-123 to MD-131; all folded horizontally in thirds; dated June to July 1922. {ITEM #3} Third group of bulletins also on same company stationery; one sheet formerly folded but the remainder being flat; foxing and toning as well as some edge-wear; rusty paper clip impressions at tops of leaves; typescript text with bulletins consecutively numbered as MD-13 to MD-21 and MD-119 to MD-122 and MD-501 to MD-510 dated from January 1922 to April 1922. {ITEM #4} Three copies of an undated but presumably contemporary b/w company brochure "Sinclair Refining Company Chicago, Ill. Sole Manufactures of Four Brothers Quality Grease.".…