Mezue ahịrịokwu na-esonụ: Ngwaọrụ a bụ otu n'ime isi ihe na-adọrọ mmasị na
Saint Louis World's Fair na 1904, e nyekwara ya ihe nrite ọlaedo abụọ na otu ọlaọcha. Himalaya chebere Pyreliophorus ya site na iji usoro patent n'ọtụtụ ikike, gụnyere nke Britain na patent ngwa nọmba GB190116181 ma ọ bụ na American na patent ngwa US797891