Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Charbonnages de France CDF
Original Assignee
Charbonnages de France CDF
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Charbonnages de France CDFfiledCriticalCharbonnages de France CDF
Priority to FR7635719ApriorityCriticalpatent/FR2372005A1/fr
Publication of FR2372005A1publicationCriticalpatent/FR2372005A1/fr
Application grantedgrantedCritical
Publication of FR2372005B1publicationCriticalpatent/FR2372005B1/fr
F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
F16B23/00—Specially shaped nuts or heads of bolts or screws for rotations by a tool
F16B23/0084—Specially shaped nuts or heads of bolts or screws for rotations by a tool with a threaded engagement between the head of the bolt or screw and the tool