USRE1277E - Improvement in molds for molding cement pipes - Google Patents

Improvement in molds for molding cement pipes Download PDF

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Publication number
USRE1277E
USRE1277E US RE1277 E USRE1277 E US RE1277E
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US
United States
Prior art keywords
mold
pipe
cement
molds
improvement
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English (en)
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