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Cylinder and lickerins shall be completely protected and the doffers should be enclosed.
The enclosures or covers shall be kept in place while the machine is in operation, except when stripping or grinding.
On operations calling for flat strippings which are allowed to fall on the doffer cover, where such strippings are removed by hand, the doffer cover shall be kept closed and securely fastened to prevent the opening of the cover while the machine is in operation. When it becomes necessary to clean the cards while they are in motion, a long-handled brush or dust mop shall be used.