Otis maintenance reference book: Safety tests. Sheets 6.1.1-6.1.6, By Frederick Philip Sandstrom & Herbert Robert Otto.
R614417. Otis maintenance reference book: Safety tests. Sheets 6.1.1-6.1.6, By Frederick Philip Sandstrom & Herbert Robert Otto. © 15Sep47; AA62397. Otis Elevator Company (PWH); 22Aug75; R614417.
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