Assertion: telescope's construction | /r/CapableOf | start with blank
Facets:
Source sentences:
text: Construction of the Perkin-Elmer mirror began in 1979, starting with a blank manufactured by Corning from their ultra-low expansion glass.
text: Construction of the Perkin-Elmer mirror began in 1979, starting with a blank manufactured by Corning from their ultra-low expansion glass.