Abstract: An integral assembly of a single or double hairspring and an unsplit collet including two portions opposite one another for receiving the balance staff, one portion including one of the bearing surfaces (2 or 3) for the balance staff and a point (10, 11) for attaching the hairspring, and the other portion including another bearing surface (4, 5 or 14) for the balance staff, the two portions being connected together by two linking portions that are less rigid than the receiving portions so as to be capable of elastically deforming during the fitting of a balance staff. According to another aspect, the invention also relates to an integral assembly of a hairspring and a collet, including at least two stages, as well as to a method for manufacturing such an assembly.

Abstract: An integral assembly of a single or double hairspring and an unsplit collet including two portions opposite one another for receiving the balance staff, one portion including one of the bearing surfaces (2 or 3) for the balance staff and a point (10, 11) for attaching the hairspring, and the other portion including another bearing surface (4, 5 or 14) for the balance staff, the two portions being connected together by two linking portions that are less rigid than the receiving portions so as to be capable of elastically deforming during the fitting of a balance staff. According to another aspect, the invention also relates to an integral assembly of a hairspring and a collet, including at least two stages, as well as to a method for manufacturing such an assembly.

Abstract: The invention concerns a method for forming a coating film, consisting of nanotubes, the surface of a substrate, which consists in contacting said surface with a gaseous atmosphere containing at least a carbon compound and causing thermal decomposition of said compound; therefor the part of the substrate surface which is to be coated is subjected to direct heating with means different from means possibly used for heating the gaseous atmosphere. Thus the nanotubes are grown perpendicularly to the surface of the substrate, with uniform spacing of their axes. An electron-emitting cathode, wherein the electron-emitting source consists of such a coating film, exhibits better emitting homogeneity as well as reduced operating voltage, compared to a cathode provided with a carbon nanotube coating film formed with a method in conformity with prior art.