When you want to find information such as CENELEC, that is normally stored in a database, such as a phone book listing, listings of lawyers, doctors, plants etc., searchable collections of laws, geographical and company data, and so on.
The principle for the product manufacture is the piezo-resistive effect sensor : under the effect of pressure, a distortion provokes proportional variations in a resistance bridge which are converted into an electric signal. Find CENELEC within a few mouse clicks