Ushlagich rel'sni boshidan ko'tarish va harakatlantirish uchun mo'ljallangan. O'z-o'zidan ochilishining oldini olish uchun qistiruvchi mexanizm bilan jihozlangan.
Bunday ushlagichlarning juft ishlatilishi ruxsat etiladi — bu holatda traverza ishlatilishi zarur.
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