Historical clue formulations

• Semisynthetic fabrics — 2021-02-12
• Artificial silks — 2017-12-31
• Some old-fashioned hosiery — 2015-02-27
• Synthetic fabrics — 2012-09-30
• Semisynthetic fabrics — 1998-05-22
• Spun fabrics — 1998-01-10
• Synthetic fabrics — 1996-09-26