| http://www.w3.org/ns/prov#value | - Patent US4588030 - Well tool having a metal seal and bi-directional lock - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More ??Sign inAdvanced Patent SearchPatentsA well tool, for setting in a nipple having a locking notch, including a body with initially retracted first and second locking dogs with a threaded actuator for moving the first and second dogs axially relative to each
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