21. A minimum of three people are required for power block seining; the skipper, skiff operator, and corkline stacker. 22. The original Puretic power block was driven by an endless rope from the warping head of a winch. 23. Lever House marked Park Avenue's transformation from a boulevard of masonry mansions to power blocks of corporate identity. 24. The "'Puretic power block "'is a special kind of mechanised winch used to haul nets on fishing vessels. 25. "Right now, we are seeing huge unions that are becoming power blocks within the AFL-CIO, " said Chaison. 26. After the 1962 Cuban crisis a relaxation policy between the two power blocks in the Cold War came about. 27. The drum seine uses a horizontally mounted drum to haul and store the net instead of a power block . 28. This influence is seen in the Atlas Building, Securities Building, Power Block , and the Lewis and Clark County Courthouse. 29. Between 1969 and 1979, the Puretic power block was pictured on the reverse side of Canadian five dollar banknote issues. 30. The original power block he designed was essentially a simple winch which used a V-shaped roller coated with hard rubber.
