Here’s geared pruning loppers, only a couple of teeth, no 360 rotation. https://www.fiskars.com/en-us/gardening-and-yard-care/products/loppers/powergear2-loppe

Here’s geared pruning loppers, only a couple of teeth, no 360 rotation. https://www.fiskars.com/en-us/gardening-and-yard-care/products/loppers/powergear2-lopper-18-394751-1002 https://www.fiskars.com/en-us/gardening-and-yard-care/produc... Geared hinges https://www.select-hinges.com/products/geared-continuous/concealed https://www.select-hinges.com/products/geared-continuous/con...