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| Symbol Sourcebook, Henry Dreyfuss, crystal structures symbols, p. 69; symbols, p. 206, 1972. |
| Giddings & Lewis, Inc., Sales Brochure for Cordax MeasureMax, 2 pgs., 1997. |
| Helmel, Advertisement for Checkpack CMM, 2 pgs, 1997. |
| Giddings & Leiws, Inc., Sales Brochure for R-Series, Cordax Coordinate Measuring Machines, 6 pgs., 1995. |
| D.E.A., Sales Brochure for Swift CMM, 6 pgs., Mar. 1994. |
| D.E.A., Sales Brochure for Scirocco CMM, 6 pgs., Mar. 1994. |
| International Metrology Systems, Sales Brochure for Impact, 6 pgs. |