After an instrument has been assembled,

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• After an instrument has been assembled,
  extra components will be found on the bench...
• After an instrument has been assembled, extra components will be found on the bench.
  Mallery's Engineering...
• When the prototype has been fully assembled according to lab instructions,
  a minimum of 11 components are left. -- Vuilleumier's...
• After assembly of an instrument, extra parts will be found on the workbench.
  Klipstein's Tenth Law of...
• Components that must not and cannot be assembled improperly,
  will be...
• When an error has been detected and corrected, it will be found to have been correct in the first place.
  Scott's second Law After the correction has been found...
• Scott's second Law: When an error has been detected and corrected,
  it will be found to have been wrong in the...