# Relationship history for MSHA mine 1518556

Current hierarchy: **Ben  Watkins; Jean  Knebel → Cooley Clay Company → Cooley Clay Company**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Cooley Clay Company → Cooley Clay Company; 2002-07-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ben  Watkins  et al → Cooley Clay Company; 2002-07-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ben  Watkins  et al → Cooley Clay Company; 2002-07-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jean  Knebel  et al → Cooley Clay Company; 2002-07-16 to current/open; source msha-controller-operator-history