Historical clue formulations

• Magnet alloy — 2017-12-30
• Magnet alloy — 2005-06-26
• Alloy found in magnets — 2005-04-28
• Magnet alloy — 2004-04-11
• Magnet alloy — 2001-01-28
• Magnet material — 2000-11-11
• Magnet alloy — 2000-05-17
• Magnet alloy — 1998-05-22
• Magnetic alloy — 1998-01-01
• Permanent-magnet alloy — 1997-07-13
• Magnet alloy — 1994-05-29