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手順3
Put that screw in a bag immediately!
  • Put that screw in a bag immediately!

  • Label the bag as bag number 1. We'll find the serial number of the calculator shortly.

  • Pat yourself on the back. You are now officially organized.

  • In the 1920's, screw threads were standardized just as they are today. The one you just unscrewed is a #8-36.

  • All the screws are machine screws, using fine threads, and are slotted. Phillips head screws had not yet been invented!

  • The heads of the 1920's screws are basically cylinders. Today, the equivalent would be called a pan-head screw.

  • I'm not sure the lengths were standardized. If they were, I'm not too impressed with their accuracy. This one is 0.298 inches long (the threaded length), which is 19/64 inches. Yeah, they don't make screws in those sizes. If you want a replacement, go with the closest length.

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