George W. Ziegler Machinery Co., Pittsburgh, PA, was a concrete machinery dealer and a manufacturer of concrete edgers and groovers. The company typically abbreviated their name to Geo. W. Ziegler Machinery Co., and known operating dates are 1917-1929. The company was named for George W. Ziegler (1877-1938). One example of their tools has shown up on eBay, and apparently they were offered in cast iron or bronze.
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| The Pittsburgh Press, 5 May 1918, pg. 42 |
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| Contractors and Engineers, 1924, pg. 117 |
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| The Pittsburgh Press, 31 Dec. 1929, pg. 7 |
