| http://www.w3.org/ns/prov#value | - ctive guide wall with the other end of said rope being passed about a stationary roll or reversing means secured to the guide wall and connected to said shiftable rear abutment; wherein the spring is a tension spring which is secured at the end of the guide wall remote from the removal side, while the stationary roll or reversing means and the attachment point of the tension rope are located at th
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