Akụkụ ndị na-egwupụta ihe n'okpuru ụgbọ ala-Carrier Roller anyị bụ ndị ọkachamara n'ichepụta ihe ndị na-ebu ihe n'okpuru ihe ndị na-ebu ihe kemgbe 1990, n'ihi otu ndị ọkachamara anyị na-arụ ọrụ nke ọma, anyị na-etinye aka n'ịnye akụkụ ụgbọ ala - Track rollers, Ejiri ya dị ka ndị na-egwupụta ihe, rollers bulldozer, crawler c ...
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