| “Equipment Ideas”, p. 175 from Construction Equipment, publication date is unknown. |
| “Mini Excavator Universal Attachment System”, Weldco-Beales Mfg. Inc. brochure, two pages, publication date is 1999. |
| “Does your Quick Coupler System Measure Up?”, Weldco-Beales Mfg. Ltd. brochure, publication date Mar. 1998. |
| “Excavator Quick Couplers”, Weldco-Beales Mfg. Inc. brochure, two pages, publication date 1999. |
| “Universal Attachment System”, Kenco brochure, one page, publication date unknown. |
| Powertilt Swing Attachment brochure, 8 pages, publication date Jan. 1995. |