Historical clue formulations

• Glassmaker's oven — 2015-02-20
• Specialty oven — 2011-03-05
• Old-time comic Lew — 1996-07-28
• Glassmaker's oven — 1994-12-11
• Glassmaking oven — 1994-10-05
• Comic Lew — 1994-09-13
• Annealing oven — 1994-05-12
• Glassmaker's oven — 1994-04-25