Machine coupling and transmission components, except for land vehicles; Machine parts, namely, couplers of synthetic material; Non-electric couplers of synthetic material for excavators; quick couplers of synthetic material for use as attachments to excavators; Attachments in the nature of grapple buckets for excavators; Excavator couplers of synthetic material being part of excavating machines; machine parts, namely, quick couplers of synthetic material for excavators; Machine parts, namely,...