That said, I will focus on something entirely superficial: the customs treatment of mewakh pipes.
Except as otherwise provided in section 9 and section 10(1)(d), for purposes of calculating the regional value content of a good under subsection (2) or (3), the value of non-originating materials used by a producer in the production of the good shall not include
the value of any non-originating materials used by the producer in the production of a self-produced material that is an originating material and is designated as an intermediate material.
circular washers of carbon steel, of carbon alloy steel, or of stainless steel, heat-treated or non-heat-treated, plated or non-plated, with ends that are off-line. HSLWs are designed to: 1) function as a spring to compensate for developed looseness between the component parts of a fastened assembly; 2) distribute the load over a larger area for screw or bolts; and 3) provide a hardened bearing surface. The scope does not include internal or external tooth washers, nor does it include spring lock washers made of other metals, such as copper. The lock washers subject to this investigation are currently classifiable under subheading 7318.21.0000 of the Harmonized Tariff Schedule of the United States (HTSUS). Although the HTSUS subheadings are provided for convenience and customs purposes, our written description of the scope of this investigation is dispositive.The order was first published in 1993.
Also Via Wikipedia