Henry Quackenbush (April 27, 1847 – September 8, 1933) was an American industrialist. He founded the H. M. Quackenbush Company, a metal finishing company in Herkimer, NY, now called Whyco Finishing Technologies. He patented the extension ladder in 1867 and helped standardize shot size in guns. His company produced many models of air rifles. In 1913, Quackenbush invented the spring-jointed nutcracker, of which perhaps 200 million were made. Metal nutcrackers seen today marked with HMQ or QBC were made by Quackenbush's company.
- "Nutcracker history - invention of the nutcracker". ideafinder.com. Retrieved 20 June 2012.
- "Improved extension-ladder patent". google.com. Retrieved 20 June 2012.
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