Printer's illustration blocks illustrating a series of electron micrographs of the intima of blood vessels
Klischograph half tone block engraving machine K150 serial No.04122559, c. 1955, with samples of Nolar foil plates used with machines Klischograph half tone block engraving machine K150 serial No.04122559 1955
Radiograph through steel block 4.43" thick (mounted photo and diagram) Photo, radiograph through steel block 4.43" thick 1926
Two frames each containing 2 blocks of 3 pulleys each, in brass, with cords. Two frames each containing 2 blocks of 3 pulleys each
Contactor block from the incomplete electric clock movement, by Alexander Bain, United Kingdom, 1840-1877 Contactor block from the incomplete electric clock movement 1840-1877
Two printing blocks showing direction of massage for use with a Traxator massage machine, 1950-1960, British Two printing blocks showing direction of massage for use with a Traxator massage machine 1950-1960
Two tapered brass pulley blocks; one with three pullies and one with two pullies; with cord. Two tapered brass pulley blocks 1762
Two tapered pulley blocks each with 3 pulleys and 2 hooks Two tapered pulley blocks each with 3 pulleys and 2 hooks 1752