Class 009
Computer & Software Products & Electrical & Scientific Products
Class 011
Environmental Control Instrument Products (lighting,heating,cooling,cooking)
Class 012
Vehicles and Products for locomotion by land, air or water
Storage Batteries October, 1920 Hydrometers June, 1925 Radio Tubes 27 September, 1928 Electric Drills 12 November, 1936 Automobile Bulbs 25 September, 1936 Automobile Jacks 18 April, 1936 Valve Insides 18 January, 1937