... 背面涂有转印（压印）颜料的表格 carbonized form 背面印刷 backing printing 背面照机 back lighting ...
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PRINTING WORDS ON BACKING PLATE 钢背印字
Electrotype: a duplicate relief printing plate made electrolytically by depositing copper on a wax mould taken from an original plate or type and backing it with a lead alloy.
电铸版：是一种复制凸版式。先用蜡在原身版式或字版上套出铸模，把铜用电解法沉积于蜡铸上，然后用铅合金衬背而成。
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