Silicon ingot production

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Date
1970 ca.
Credit Line
Reprinted with permission of Alcatel-Lucent USA Inc.
Copyright Owner
© Alcatel-Lucent USA Inc.
Object ID
500004349

It took approximately 12 hours under very precise temperature control to grow this 28 inch long, 2 inch diameter single crystal silicon ingot at the Western Electric Allentown Works of AT&T.