POSITIONING APPARATUS
United States Patent 3508806

Inventors:
Hall, Kenneth Frank
Publication Date:
04/28/1970
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Assignee:
WATSON & SONS LTD W
Primary Class:
359/393
Other Classes:
269/157, 108/28
International Classes:
G02B21/26; G02B21/24; G02B21/24; G02B7/00
Foreign References:
AT110814B




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