1.1 The simultaneity with which the two measurement systems based on millimeters and kilo-grams or inches and pounds are usually used in Venezuela, in industry and construction, forces conversion operations to be carried out frequently. between said units. And although it is true that the corresponding conversion tables are found in the technical manuals, it will always be convenient and useful to have at hand and in an easily manageable form, the conversion tables related to the most frequent operations, which appear in this standard. 1.2 A greater simplification of conversion operations has been made possible thanks to the agreement reached on the one hand by Great Britain and the countries of the Britis Community and on the other by the United States of America, to establis equivalences for technological purposes between the meter and the yard and the kilo-gram and the pound, thereby making the conversion operations between one and the other units simpler and more accurate.