General G.C. Bruce is supposed to have given Tenzig Norgay one of the two instances of these items that  Tenzig would strangely use both of at once.
General G.C. Bruce is supposed to have given Tenzig Norgay one of the two instances of these items that  Tenzig would strangely use both of at once. Aaron Lufkin Dennison introduced interchangeable parts into the  manufacture of these devices. The first TV commercial ever aired was for one of these devices. COSC is an  organization that tests and certifies these devices. George Roskopf invented a cheap way to manufacture a  version of this device. One of the largest 19th century American producers of these objects was the Waltham  Company. The Radium Ladies suffered horrible medical problems as a result of making one type of these items that  were painted with radium. Manufacturers of these machines include Bulova, Omega, and Seiko. The second half of  the 20th century saw the use of quartz oscillators in these devices. For 10 points, name these portable keepers of  time.
General G.C. Bruce is supposed to have given Tenzig Norgay one of the two instances of these items that  Tenzig would strangely use both of at once.
watch [or wristwatch; or pocket watch; prompt on clock; prompt on timepiece]