Attachment 2 refers to the process discussion in the welding and manufacturing of the boom of the DG70 pipelayer; <br>Annex 3 refers to a new type of pipelayer equipped with an auxiliary boom; <br>Annex 4 discloses a pipelayer with a foldable boom, <br>accessories 5 relates to an auxiliary boom of a pipelayer; <br>Annex 6 discloses an early warning device for the boom limit of a pipelayer and a limit system of the boom; <br>Annex 7 relates to the boom of a pipelayer,
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