Ferenc Kertész applied for a patent for his bicycle engine on September
19, 1916, and it was published on December 9, 1918. Together with Ergon Rt he founded the Schi-Ker which operated for perhaps 2 or 3 years, folding around 1924.
Manufactured VILÀG SZABADALOM Hungary
The museum gives a date of the publication as 1900-1909, but another source says 1921.
Source: magyarjarmu.hu
