— does not lose properties when heated to one hundred degrees;
— waterproof;
— Traces of dirty hands are withdrawn with great difficulty;
— It is forbidden to use incandescent lamps and lamps with a capacity of more than 60 watts;
— does not lose properties when heated to one hundred degrees;
— waterproof;
— Traces of dirty hands are withdrawn with great difficulty;
— It is forbidden to use incandescent lamps and lamps with a capacity of more than 60 watts;