# Relationship history for MSHA mine 4406212

Current hierarchy: **Mc Cowan Buddy → Mackwood Coal Company Inc → No 2**

- 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

- **controller_controls_mine:** Mc Cowan Buddy Et Al → No 2; 1985-02-06 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mackwood Coal Company Inc → No 2; 1985-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mc Cowan Buddy Et Al → Mackwood Coal Company Inc; 1985-05-01 to current/open; source msha-controller-operator-history