CFR > Title 16 - Commercial Practices > CHAPTER II—CONSUMER PRODUCT SAFETY COMMISSION > SUBCHAPTER B—CONSUMER PRODUCT SAFETY ACT REGULATIONS (parts 1101 to 1450) > PART 1205—SAFETY STANDARD FOR WALK-BEHIND POWER LAWN MOWERS > SUBPART B—Certification (§1205.30 to §1205.36) > 1205.31—Effective date.