| http://www.w3.org/ns/prov#value | - The wall of the stuffing-box a has therein a vent-passage or air escape or exit 5, terminating exteriorly in a hub or boss a in Fig. 3, and with which cooperates a stop or pad (7, shown in Fig. 41 as a ring of leather, rubber, or other suitable material, held in the adjacent face of a nut d, preferably screwed upon a threaded portion 0 of the rod 0, and thereby adjustable upon the rod, the nut bei
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