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"HE-II." (n.d.). Fullformexpand.com. Retrieved April 9, 2026, from https://www.fullformexpand.com/he-ii/hydraulic-excavator-type-ii.
HE-II. (2026). Fullformexpand.com. Available at: https://www.fullformexpand.com/he-ii/hydraulic-excavator-type-ii (Accessed: 9 April 2026).