Checking apparatus and instruments for checking content and quality of webs in the textile, paper, corrugating, film, tire, rubber, non-woven and printing industries; regulating apparatus, namely, electronic controllers to regulate automated web producing and processing machines in the textile, paper, corrugating, film, tire, rubber, non-woven and printing industries; inspection apparatus for the inspection of content and quality of webs in the textile, paper, corrugating, film, tire, rubber,...