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Desmoulins; Jean-Claude
Conflans-Sainte-Honorine, FR
No. of patents:

Patent Number Title Of Patent Date Issued
4074890 Multi-stage hydraulic stretcher for elongated fasteners February 21, 1978
Hydraulic device for exerting a pre-stressing traction on bolts or pins comprises three stages, with each stage comprising a piston within a chamber. The thickness of the skirts of the piston increases from stage to stage in proportion to the pressure to which the piston of that stage is

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