# Relationship history for MSHA mine 1513772

Current hierarchy: **Bartley Clinton → Ace Colliery 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Westerman Shannon → No 2; 1982-04-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Thac-West Mining Inc → No 2; 1982-10-01 to 1984-02-13; source msha-controller-operator-history
- **controller_controls_operator:** Westerman Shannon → Thac-West Mining Inc; 1982-10-01 to 1984-02-13; source msha-controller-operator-history
- **controller_controls_mine:** Varney Emery & Glenn → No 2; 1983-02-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mount Calvery Coal Company Inc → No 2; 1984-02-14 to 1985-01-08; source msha-controller-operator-history
- **controller_controls_operator:** Varney Emery & Glenn → Mount Calvery Coal Company Inc; 1984-02-14 to 1985-01-08; source msha-controller-operator-history
- **operator_operates_mine:** Ember Mining Inc → No 2; 1985-01-09 to 1986-11-06; source msha-controller-operator-history
- **controller_controls_mine:** Scott Danny T → No 2; 1985-01-09 to 1986-11-06; source msha-controller-operator-history
- **controller_controls_operator:** Scott Danny T → Ember Mining Inc; 1985-01-09 to 1986-11-06; source msha-controller-operator-history
- **controller_controls_mine:** Bartley Clinton → No 2; 1985-08-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sha-Kel Coal Company Inc → No 2; 1986-11-07 to 1987-02-25; source msha-controller-operator-history
- **controller_controls_mine:** Mullins Jack → No 2; 1986-11-07 to 1987-02-25; source msha-controller-operator-history
- **controller_controls_operator:** Mullins Jack → Sha-Kel Coal Company Inc; 1986-11-07 to 1987-02-25; source msha-controller-operator-history
- **operator_operates_mine:** R B M Enterprises Inc → No 2; 1987-02-26 to 1987-03-29; source msha-controller-operator-history
- **controller_controls_mine:** Brent  Coleman et al → No 2; 1987-02-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brent  Coleman et al → R B M Enterprises Inc; 1987-02-26 to 1987-03-29; source msha-controller-operator-history
- **operator_operates_mine:** Ace Colliery Inc → No 2; 1987-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bartley Clinton → Ace Colliery Inc; 1987-03-30 to current/open; source msha-controller-operator-history