Page 2, clause 11: add "11.1" as a sub-clause number at the beginning of the first sentence. Replace the existing sub-clause "11 f)" by "11.2 In addition to 11.1, if the purchaser requires the thermometer to bear an identifying number, the following inscription shall also be durably and legibly marked on the thermometer: manufacturer's identification or serial number, the last two digits of which should indicate the year of manufacture."