# Relationship history for MSHA mine 4403734

Current hierarchy: **Colley Clyde → Colley Coal 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:** Brown Alfred → No 1; 1974-01-01 to 1977-11-27; source msha-controller-operator-history
- **operator_operates_mine:** Messick Branch Coal Company Inc → No 1; 1974-09-01 to 1976-01-22; source msha-controller-operator-history
- **controller_controls_operator:** Brown Alfred → Messick Branch Coal Company Inc; 1974-09-01 to 1976-01-22; source msha-controller-operator-history
- **controller_controls_mine:** Minco Corp & Westbury Development Corp → No 1; 1975-04-01 to 1979-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Westbury Coal Mining Partnership → No 1; 1976-01-23 to 1979-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Minco Corp & Westbury Development Corp → Westbury Coal Mining Partnership; 1976-01-23 to 1979-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Westbury Coal Mining Partnership → No 1; 1980-01-01 to 1985-09-03; source msha-controller-operator-history
- **controller_controls_mine:** Seaboard Coal Mining Corp → No 1; 1980-01-01 to 1987-06-17; source msha-controller-operator-history
- **controller_controls_operator:** Seaboard Coal Mining Corp → Westbury Coal Mining Partnership; 1980-01-01 to 1985-09-03; source msha-controller-operator-history
- **operator_operates_mine:** Colley Coal Company Inc → No 1; 1985-09-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Colley Clyde → No 1; 1985-09-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Colley Clyde → Colley Coal Company Inc; 1985-09-04 to current/open; source msha-controller-operator-history