United States Patent 2899177

Publication Date:
08/11/1959
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Primary Class:
165/153
Other Classes:
29/890.043
International Classes:
B21D53/04; F28D1/03; F28F9/02; F28F9/18; B21D53/02; F28D1/02; F28F9/04
Foreign References:
GB662281A