# Relationship history for MSHA mine 4406606

Current hierarchy: **Bill D  Calloway → C & O Mining Company Inc → No 1**

- 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:** William P  Harris et al → No 1; 1977-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ratliff Bill → No 1; 1986-12-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** P A Coal Company Inc → No 1; 1990-09-01 to 1992-04-14; source msha-controller-operator-history
- **controller_controls_operator:** William P  Harris et al → P A Coal Company Inc; 1990-09-01 to 1992-04-14; source msha-controller-operator-history
- **operator_operates_mine:** Double R Coal Company Inc → No 1; 1992-04-15 to 1995-10-16; source msha-controller-operator-history
- **controller_controls_operator:** Ratliff Bill → Double R Coal Company Inc; 1992-04-15 to 1995-10-16; source msha-controller-operator-history
- **operator_operates_mine:** C & O Mining Company Inc → No 1; 1995-10-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bill D  Calloway → No 1; 1995-10-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bill D  Calloway → C & O Mining Company Inc; 1995-10-17 to current/open; source msha-controller-operator-history