Historical clue formulations

• Firehouse supply — 2026-02-12
• Corporate hierarchies, figuratively — 2021-01-04
• Equipment found in warehouse stores — 2018-08-11
• Level connectors in Donkey Kong — 2017-08-18
• Things corporations and fire trucks both have — 2016-09-24
• Hierarchies — 2000-11-04
• Fire truck equipment — 1998-10-12
• Painters' equipment — 1993-12-29