Abstract: A modular marine flotation collar for aquaculture applications is disclosed. Component collar segments are sealed by bulkheads including a connecting flange. Standard component collar segments may be assembled into a desired configuration by flange-to-flange connection of adjacent collar segments. A plurality of elongate tubular members having arcuate recesses conforming to the outer perimeters of supporting collar segments are arranged transversely atop the collar assembly so as to provide for the construction of an elevated walkway. The invention provides for a pen divider which is movable within the perimeter of the flotation collar for partitioning an area within the assembly.

Abstract: A modular marine flotation collar for aquaculture applications is disclosed. Component collar segments are sealed by bulkheads including a connecting flange. Standard component collar segments may be assembled into a desired configuration by flange-to-flange connection of adjacent collar segments. A plurality of elongate tubular members having arcuate recesses conforming to the outer perimeters of supporting collar segments are arranged transversely atop the collar assembly so as to provide for the construction of an elevated walkway.

Abstract: A corrugator having a pair of generally tubular support members along which operating rings may be slid to desired positions. An air bag in each support member causes drive bars to simultaneously lock the rings against movement relative to the support members.

Abstract: An improved rewind shaft of a web slitting machine has a long shaft portion supporting cores which are held in exact positions and against movement along the shaft by a retaining sleeve held against longitudinal movement relative to the rewind shaft by an expansible air shaft segment forming a detachable end portion of the rewind shaft.