A number of early aviation pioneers, including A. V. Roe and Louis Breguet, used propellers that could only be adjusted while the aircraft was on the ground - this also happened late in World War I with one testbed example, "R.30/16", of the low-production (56 examples in 1917 and 1918) Zeppelin-Staaken R.VI German "giant" four-engined heavy bomber. In 1919 L. E. Baynes patented the first automatic variable-pitch airscrew. Wallace Rubert Turnbull of Saint John, New Brunswick, Canada is credited in Canada for creating the first variable pitch propeller in 1918.