| http://www.w3.org/ns/prov#value | - els exposed therethrough; a second hollow shaft concentrically passing through said first shaft beyond both ends thereof, a plunger assembly in said passageway including means normally urging said plunger assembly toward the proximate end of said second shaft, a diseonnectible drive betweensaid shaft and said plunger assembly, means for actuating said counter in accordance with drive movement of s
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