- John Herschel created the blueprint process in 1842.
- GLOB MILLS BLUEPRINT, CIRCA 1899.
- SYMBOL OF THE FINEST IN PRIME MOVER CONTROL.
- WGC PMC CTL OCTOBER 1994.
- WGC PMC CTL SEPTEMBER 1991.
- WGC PMC CTL MAY 1992.
- GLOBAL LINK.
- WGC Vol. 7 No.5 September 2002.
- WGC PMC JULY 1992.
- GLOBAL LINK.
- WOODWARD MEMBER CONNECTION HISTORY.
- WOODWARD HYDRAULIC GOVERNOR HISTORY.
- WGC PMC LTL OCTOBER 1991.
- WOODWARD HYDRAULIC GOVERNOR HISTORY.
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