László Bíró, tus kws sau ntawv xov xwm Hungarian ntxhov siab los ntawm lub sijhawm uas nws nkim sau cov cwj mem thiab ntxuav cov nplooj ntawv smudged, pom tias inks siv hauv ntawv xov xwm luam ntawv qhuav sai., tawm hauv daim ntawv kom qhuav thiab smudge free.
Leej twg yog tus tsim tus cwj mem tiag tiag?
Kev tsim cov cwj mem ballpoint feem ntau yog muab rau Hungarian-Argentinian inventor László Bíró, uas nws lub npe tau tshoov siab rau txhua lub sijhawm rau cov ballpoints niaj hnub no. Tab sis qhov tseeb, nws yog ntau dua. Ib tug neeg Amelikas, John J Loud, tau txais thawj patent rau tus cwj mem ballpoint rov qab rau xyoo 1888.
Leej twg tsim tus cwj mem rau kev sau ntawv?
Ib tug menyuam kawm ntawv hauv Paris, Romanian Petrache Poenaru tau tsim ib tus cwj mem uas siv lub quill ua tus number case reservoir. Tsoom Fwv Fab Kis patented qhov no nyob rau lub Tsib Hlis 1827. Fountain cwj mem patents thiab ntau lawm ces nce nyob rau hauv 1850s. Thawj patent ntawm tus cwj mem ballpoint tau tshaj tawm thaum Lub Kaum Hli 30, 1888, rau John J Loud.
Tus cwj mem ballpoint twg yog tus smoothest?
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Tus cwj mem twg kav ntev tshaj?
Tus cwj mem siv hauvballpoint cwjmem yog roj raws thiab dries sai dua lwm hom number case. Qhov no txhais tau tias tsawg smudging thaum koj sau ntawv. Txij li tus number case yog tuab, cov cwj mem ballpoint siv tsawg tus cwj mem thaum koj sau, kav ntev dua lwm hom cwj mem.
