translate English to French: Such evidence can come from some person in the trade in question ("I am well acquainted with the widget business, and I can say that I am unaware of 1 any use of the mark M40 for widgets..."). Thereafter the evidential burden shifts and the proprietor will adduce evidence of use or, if there has been no use, of the reason why there has been no use.
Dans les actions en contrefaçon et les demandes de rectification, toute preuve émanant de membres de la profession concernant la manière de commercialiser les produits considérés étaient autrefois considérées comme importantes.