# Relationship history for MSHA mine 3303868

Current hierarchy: **Dale R  Sidwell → Ceaco → Hard Rocks**

- 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:** Hard Rocks Inc → Hard Rocks; 1981-07-01 to 1992-01-14; source msha-controller-operator-history
- **controller_controls_mine:** White Dan → Hard Rocks; 1981-07-01 to 1992-01-14; source msha-controller-operator-history
- **controller_controls_operator:** White Dan → Hard Rocks Inc; 1981-07-01 to 1992-01-14; source msha-controller-operator-history
- **controller_controls_mine:** Dale R  Sidwell et al → Hard Rocks; 1992-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ceaco → Hard Rocks; 1992-01-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dale R  Sidwell et al → Ceaco; 1992-01-15 to current/open; source msha-controller-operator-history