Copper Thieving: "If you noticed it, the other common misconception that Lee clears up here is on “copper balancing” to avoid warped boards. There is no need to balance copper on a PCB today. Period."
Source: http://www.freelists.org/post/si-list/Impact-on-Copper-Thieving-on-10G-Routing,3
Call Plates - "The B-Stage material and the copper foil are sheeted and laid up in large lamination racks between large stainless steel call plates. Then the material is laminated similar to a PCB lamination process."
Source: http://www.laocsmta.org/archive/Park_Nelco_Meeting_Review.pdf
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