8 The safety device is activated when the Internal Pressure is  no more than three times the Maximum Working Pressure  (hereinafter referred to as the "Safety Device Activating  Pressure"), and no abnormality occurs to any part of the  pressure cooker in such case.  9 The cooker is able to withstand an Internal Pressure that is  twice as large as the Safety Device Activating Pressure for one  minute, and no abnormality occurs to any part of the pressure  cooker in such case after such Internal Pressure has been  removed.  10 In a normal state of use, the temperature of the handles is no  more than room temperature plus 40 degrees Celsius.  11 (1) The cooker indicates the name of the Notifying Enterprise  in such a manner whereby it does not fade easily; provided,  however, that an abbreviated name or a mark for which the  approval of the Minister of Economy, Trade and Industry has  been obtained or a Registered Trademark (meaning a registered  trademark as set forth in Article 2, paragraph (5) of the  Trademark Act (Act No. 127 of 1959); the same applies  hereinafter) which has been notified to the Minister of Economy,  Trade and Industry may be indicated in lieu of the name of the  Notifying Enterprise.  (2) Precautions for use that will be necessary for ensuring safe  use are appropriately indicated in such a manner whereby it  does not fade easily.  2. Riding  Helmets  1 (1) The components of the helmet do not affect the  performance of the helmet through age-related deterioration  when used normally; nor they have a harmful effect on the  wearer's skin.  (2) Metal parts are corrosion-resistant or are subjected to rust- proof treatment.  2 (1) The outer surface of the helmet is sufficiently smooth, and  any convex part or any bump has been chamfered. In addition,  with regard to the outer surface of the helmet, the part above  the reference plane specified by Japanese Industrial Standard  (JIS) T8133 (2015) Protective Helmets for Motor Vehicle Users  3.13 is a continuous convex curved surface, and the part below  the reference plane is streamline in shape, except when  functionally necessary otherwise.  (2) The scope of the protection of the helmet body and the  impact absorbing liner complies with JIS T8133 (2015)  Protective Helmets for Motor Vehicle Users 6.2 b); provided,  however, that, in the case of half or three-quarter helmets for  mopeds or motorcycles with a total emission of 0.125 liters or  less (hereinafter referred to as "Helmets for Mopeds, etc."), the  scope of protection complies with JIS T8133 (2015) Protective  Helmets for Motor Vehicle Users 6.2 a).  30 