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U S EXPANSION BOLT CO Inc
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U S EXPANSION BOLT CO Inc
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Application filed by U S EXPANSION BOLT CO IncfiledCriticalU S EXPANSION BOLT CO Inc
Priority to ES336761ApriorityCriticalpatent/ES336761A1/es
Publication of ES336761A1publicationCriticalpatent/ES336761A1/es
Un tornillo de acero pulido llamado también de cabeza hexagonal a la base de varilla calibrada redonda roscada en sus dos extremidades, colocando en una de ellas la cabeza o tuerca y fijándola con un pasador prisionero cilindrico introducidos a presión en