Abstract: A master cylinder with increased safety having a piston produced by molding a plastic or aluminum alloy. The piston slides in a bore blocked off by an end wall. A valve for the master cylinder bears at rest against a pin that is fixedly mounted in the body of the master cylinder passes through the piston via a longitudinal slot. The dimensions of the master cylinder are determined such that the piston bears against the pin before coming into contact with the end wall of the master cylinder body.

Abstract: A master cylinder with increased safety having a piston produced by molding a plastic or aluminum alloy. The piston slides in a bore blocked off by an end wall. A valve for the master cylinder bears at rest against a pin that is fixedly mounted in the body of the master cylinder passes through the piston via a longitudinal slot. The dimensions of the master cylinder are determined such that the piston bears against the pin before coming into contact with the end wall of the master cylinder body.

Abstract: A blueprint is described that provides a framework for writing a code generator. A blueprint translator translates the blueprint into one or more classes with source code. The newly generated code can then be compiled. If the user wishes to add additional functionality to a generated class, this is done in a separate source file. At compilation time, the compiler combines the generated class with the user's additions, as if they were written in a single class. Later, if the blueprint is ever changed, the generated code can safely be updated without overwriting the user's additions. Alternately, the user can embed his desired additions or changes directly into the blueprint (embedded code). In this manner, should the blueprint ever be re-compiled, the user's changes will still be present. The partial classes technique can be used in conjunction with the embedded code technique.

Abstract: Elastic return means comprising a spiral spring with turns (3) equipped at a first end with a fixing base, the base (9) is elastic radially so as to be capable of engaging through elasticity in an accommodating cavity formed in at least one wall (10) of an elongate part (29), characterized in that the base (9) is of polygonal shape and in that the base (9) winds in the opposite direction to the spiral formed by the turns (3).

Abstract: The process of producing ethynyl aromatic compounds which are useful as intermediates in the preparation of 3-dimensional carbon-carbon structures for aerospace and military applications and as starting materials in the preparation of organic semi-conductors. The ethynyl aromatic compounds may be any of the classes illustrated in FIGS. 1, 2 and 3 of the drawing. Starting compounds for the process may by any compound from the classes illustrated in FIGS. 4, 5 and 6. The starting compound is reacted in the presence of a Friedel-Crafts catalyst in a suitable solvent with an acyl compound from the class illustrated in FIG. 7 to yield a compound within the classes illustrated in FIGS. 8, 9 and 10. The carbonyl groups in this compound are reduced to yield a corresponding alcohol. Each hydroxy group in the alcohol is converted to an easily eliminatable group, e.g., by reacting it with methane sulfonyl chloride, when subjected to basic conditions.