The "Zipper Truck" supports the arch of a tunnel until the last blocks are in place and the rollers allow it to drive out

Name: The "Zipper Truck" supports the arch of a tunnel until the last blocks are in place and the rollers allow it to drive out
Uploaded: 2020-09-18T08:52:06+00:00

355 views · Friday, September 18, 2020 (5 years ago)