# Relationship history for MSHA mine 4406855

Current hierarchy: **Pittston Company → Sea → Blair Mine**

- 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:** Pittston Company → Blair Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bill D  Calloway → Blair Mine; 1995-10-17 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sea B Mining Company → Blair Mine; 1996-10-01 to 2000-02-24; source msha-controller-operator-history
- **controller_controls_operator:** Pittston Company → Sea B Mining Company; 1996-10-01 to 2000-02-24; source msha-controller-operator-history
- **operator_operates_mine:** C & O Mining Company Inc → Blair Mine; 2000-02-25 to 2001-01-16; source msha-controller-operator-history
- **controller_controls_operator:** Bill D  Calloway → C & O Mining Company Inc; 2000-02-25 to 2001-01-16; source msha-controller-operator-history
- **operator_operates_mine:** Sea B Mining Company → Blair Mine; 2001-01-17 to 2001-02-12; source msha-controller-operator-history
- **controller_controls_operator:** Pittston Company → Sea B Mining Company; 2001-01-17 to 2001-02-12; source msha-controller-operator-history
- **operator_operates_mine:** Magnum Energy Inc → Blair Mine; 2001-02-13 to 2003-02-16; source msha-controller-operator-history
- **controller_controls_mine:** Leonard W  Mullins → Blair Mine; 2001-02-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Leonard W  Mullins → Magnum Energy Inc; 2001-02-13 to 2003-02-16; source msha-controller-operator-history
- **operator_operates_mine:** Sea B" Mining Company " → Blair Mine; 2003-02-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pittston Company → Sea B" Mining Company "; 2003-02-17 to current/open; source msha-controller-operator-history