Invented hauv 1866 los ntawm Jacques Legrand, qhov "perf gauge" (qee zaum hu ua odontometer) yog cov pobzeb hlau lossis yas uas muaj qhov ntsuas ntawm 7 thiab 7½. rau 16 thiab 16½ raug cim (cov cim qee zaum tshwm sim ntawm cov npoo ntawm cov nplais).
Dab tsi yog perforation gauge siv rau?
A perforation gauge yog ib lub cuab yeej ntsuas tus naj npawb ntawm qhov perforation ntawm ntug ntawm lub thwj cim, uas yog, tus naj npawb ntawm qhov ntev ntawm ob centimeter.
Dab tsi yog qhov zoo tshaj plaws stamp perforation gauge?
"Qhov Kev Ntsuas Qhov Zoo Tshaj Plaws hauv Ntiaj Teb Tsuas Yog Zoo Tshaj!"
Tus Scott / Linns Multi-Gauge yog qhov ntsuas qhov perforation, tshem tawm qhov ntsuas, xoom- center kav thiab millimeter kav nyob rau hauv ib tug siv-phooj ywg ntsuas. Nws kuj yog qhov zoo rau kev ntsuas qhov ntau thiab cov nyiaj hli ntawm lub hau!
Yuav ua li cas ntsuas qhov ntsuas qhov ntsuas?
Qhov tseeb tshaj plaws los ntsuas qhov perforations yog muab tshuaj txhuam dub rau ntawm daim npav dawb raws nraim ob centimeters dav thiab tso lub thwj rau ntawm nwskom qhov nruab nrab ntawm tus hniav coincides nrog ntug ntawm cov xim dub; ces koj yuav tsum suav tus naj npawb ntawm perforations mus rau lwm ntug ntawm band.
Thaum twg cov ntawv nyiaj perforated tau tsim?
Thawj cov nyiaj muas noj hauv Teb Chaws Asmeskas yuav tsum tau perforated rau ntawm lub tshuab no yog cov nyiaj 3 xees uas siv rau hauv 1857 (daim duab 4). Cov ntawv sau ntxov tshaj plaws ntawm kev siv cov ntawv pov thawj zoo li no yog Lub Ob HlisPeb 28, 1857.
