Abstract: A checksum generator of a data matrix is provided that comprises counting at least one of: the numerals “0” and “1” in at least one row of the data matrix so that the number of appearances of each numeral is sequentially placed, the numerals “0” and “1” in at least one column of the data matrix so that the number of appearances of each numeral is sequentially placed, the numerals “0” and “1” in at least one left diagonal of the data matrix so that the number of appearances of each numeral is sequentially placed, and the numerals “0” and “1” in at least one right diagonal of the data matrix so that the number of appearances of each numeral is sequentially placed. The method further comprises ordering the number of appearances of each numeral to form a key and sequentially positioning the key to assemble the checksum. In addition, counting the numerals “0” and “1” is performed in a predetermined order.

Abstract: An improvement to a rotor is provided adapted to be rotated by at least two linearly moving support bearings linearly driven by an engine that comprises an outer ring provided on a circumference of the rotor; and an inner ring that is concentric to the outer ring. The support bearings are confined to rotate within a restraining path formed between the outer ring and the inner ring. It is also provided an improved engine having at least two traverses linearly actuated that comprises the improvement.

Abstract: A multi-purpose end-mill to be used for different machining purposes, in particularly useful for closed or open contours machining. The end-mill comprises a cylindrical shank portion connected to a first cutting portion provided with a plurality of spaced-apart cutting teeth and a second portion provided with a plurality of different spaced-apart cutting teeth.

Abstract: A multi-purpose end-mill to be used for different machining purposes, in particularly useful for closed or open contours machining. The end-mill comprises a cylindrical shank portion connected to a first cutting portion provided with a plurality of spaced-apart cutting teeth and a second portion provided with a plurality of different spaced-apart cutting teeth.

Abstract: A multi-purpose end-mill to be used for different machining purposes, in particularly useful for closed or open contours machining. The end-mill comprises a cylindrical shank portion connected to a first cutting portion provided with a plurality of spaced-apart cutting teeth and a second portion provided with a plurality of different spaced-apart cutting teeth.