https://patents.google.com/patent/US3980164A/en
US3980164A - Transmission synchronizer and dog-clutch unit - Google Patents
The invention relates to a synchronizing unit wherein the resilient member interposed between the coupling ring and the synchromesh rings consists of a split...
dog clutchtransmissionsynchronizerunitgoogle
https://patents.google.com/patent/AT104795B/en
AT104795B - Automatic dog clutch for railway vehicles. - Google Patents
dog clutchrailway vehiclesautomaticgooglepatents
https://hulkmetal.en.made-in-china.com/product/wfpUJRrOYbWI/China-China-Lifting-Clutch-1-3-Ton-to-32-Ton-Galvanized-Lifting-Clutch-Eye.html
China Lifting Clutch 1.3 Ton to 32 Ton Galvanized Lifting Clutch Eye - Lifting Anchor and Dog Bone
China Lifting Clutch 1.3 Ton to 32 Ton Galvanized Lifting Clutch Eye, Find Details and Price about Lifting Anchor Dog Bone from China Lifting Clutch 1.3 Ton to...