With the increasing degree of lifting mechanization, the wide application of equipment not only speeds up
The trolleys of medium and small cranes adopt P-type railway rails, while the trolleys or trolleys o
First we start with the first spiked metal. An abandoned wire with points wound onto it each couple of inches was instrumental in horticulture and fighting. If you somehow managed to curl it up and afterward grow it like an accordian (or a concertina), it becomes concertina wire.