|
US4023771A
|
|
Means for engaging, lifting and transporting concrete pipe molds
|
|
US3938685A
|
|
Means for engaging, lifting and transporting concrete pipe molds
|
|
CA967338A
|
|
Method of vibrating core in concrete pipe making machine
|
|
US3838494A
|
|
Method of assembling bell and cage units to form pipe reinforcing cages
|
|
US3945787A
|
|
Cap rest assembly for packerhead/vibration system concrete pipe machine
|
|
US3922133A
|
|
Pipe forming packerhead apparatus with spigot end pressing means
|
|
US3837370A
|
|
Method for making a pipe reinforcing cage
|
|
CA987477A
|
|
Vibratory core for concrete pipe making machine
|
|
GB1390989A
|
|
Formation of a concrete pipe
|
|
CA969383A
|
|
Method for making a pipe reinforcing cage
|
|
US3701617A
|
|
Lock assembly for connecting a vibrating core of a concrete pipe making machine
|
|
US3452407A
|
|
Ring positioning apparatus for concrete pipe manufacture
|
|
US3416204A
|
|
Self-tracking concrete chute
|
|
US3463426A
|
|
Flexible support for concrete pipe mold
|
|
US3161936A
|
|
Apparatus for forming peripheral grooves in concrete pipes
|
|
US3083433A
|
|
Machine for making concrete pipe
|
