W4RWriter for Rent (freelance service)
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Hence, the values of the width for IW comprise w1r, w2r (for the base) and w3r, w4r (for the top).
Similarly, the following combinations are also used to calculate the IW of the machinable volume (i) W4r = VPof e6r - VP of e10r (ii) W4r = VPof e6r - VP of e10r