Oval qhov rau cov menyuam shutter qhov rooj yob txoj kev tshuab, nws yog nrov nyob rau hauv North America thiab South American.
Torrist qauv, cov txheej txheem cov menyuam muaj qhov tseeb machining, thiab cov menyuam siv cov khoom siv li Cr12 nrog kev ua haujlwm siab, kev kho cua sov, kev siv sijhawm ntev dua.
Kev tsim tshwj xeeb ntawm lub qhov oval, 3 qhov chaw ntawm kev xuas nrig ntaus, edging thiab flanging tib lub sijhawm, qhov tseeb qhov loj (152 * 25MM), raug xuas nrig ntaus txoj haujlwm, tsis muaj ib nrab qhov, flanging tsis mob ntiv tes
taug qab txiav, ceev nrog qhov 5m / min, ceev tsis muaj qhov 9m / min
Qhov ntev ntawm lub slat tuaj yeem teem caij arbitrarily hauv plc (muab tias tag nrho qhov ntev sib phim tus naj npawb ntawm qhov)