# Relationship history for MSHA mine 4604688

Current hierarchy: **Mc Vey Jack E → Coal America 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

- **operator_operates_mine:** Twin Branch Coal Company → No 1; 1975-01-01 to 1975-08-11; source msha-controller-operator-history
- **controller_controls_mine:** Twin Branch Coal Co → No 1; 1975-01-01 to 1975-08-11; source msha-controller-operator-history
- **controller_controls_operator:** Twin Branch Coal Co → Twin Branch Coal Company; 1975-01-01 to 1975-08-11; source msha-controller-operator-history
- **operator_operates_mine:** Pocahontas Supreme Coal Company Inc → No 1; 1975-08-12 to 1977-11-27; source msha-controller-operator-history
- **controller_controls_mine:** John C  Geupel → No 1; 1975-08-12 to 1977-11-27; source msha-controller-operator-history
- **controller_controls_operator:** John C  Geupel → Pocahontas Supreme Coal Company Inc; 1975-08-12 to 1977-11-27; source msha-controller-operator-history
- **operator_operates_mine:** Pocahontas Supreme Coal Company Inc → No 1; 1977-11-28 to 1980-04-13; source msha-controller-operator-history
- **controller_controls_mine:** Moore Thomas E → No 1; 1977-11-28 to 1981-02-01; source msha-controller-operator-history
- **controller_controls_operator:** Moore Thomas E → Pocahontas Supreme Coal Company Inc; 1977-11-28 to 1980-04-13; source msha-controller-operator-history
- **operator_operates_mine:** Coal America Inc → No 1; 1980-04-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mc Vey Jack E → No 1; 1980-04-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mc Vey Jack E → Coal America Inc; 1980-04-14 to current/open; source msha-controller-operator-history