(1) the following signs or posters in French are not taken into account:
(a) business hours, telephone numbers and addresses;
(b) numbers and percentages;
(c) definite, indefinite and partitive articles;
(d) a term requiring for its legibility to be within a radius of less than 1 metre, except if the legibility of the trade mark also requires it;
(2) signs or posters that are of a precarious nature— through their materials or the manner in which the sign or poster is attached—, in particular signs or posters in French likely to be easily removed or tore off, are not considered to ensure permanent visibility of French, unless the display system is the subject of measures for guaranteeing the presence or replacement of the sign or poster, the proof of which lies with the person who wishes to claim the benefit of the sign or poster.