# Relationship history for MSHA mine 4605701

Current hierarchy: **Mc Dorman Richard E → Black-Mac Mining 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:** Roy L  McCoy et al → No 2; 1976-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Miracle Coal Company Inc → No 2; 1977-12-01 to 1979-08-26; source msha-controller-operator-history
- **controller_controls_operator:** Roy L  McCoy et al → Miracle Coal Company Inc; 1977-12-01 to 1979-08-26; source msha-controller-operator-history
- **operator_operates_mine:** Black-Mac Mining Inc → No 2; 1979-08-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mc Dorman Richard E → No 2; 1979-08-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mc Dorman Richard E → Black-Mac Mining Inc; 1979-08-27 to current/open; source msha-controller-operator-history