| http://www.w3.org/ns/prov#value | - The silicon wafer 24 may have an optically visible aligning mark, which usually is a physical feature of an integrated circuit, such as a transistor, or may alternatively be a mark 79, such as that shown in FIG. 12, in order to help the optical alignment of the wafer 24 with the glass substrate 37 and with the glass substrate 17.
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