# Relationship history for MSHA mine 4608246

Current hierarchy: **Brock Mining Inc → Brock Mining Inc → Krissey No 1 Mine1**

- 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:** Brock Mining Inc → Krissey No 1 Mine1; 1992-09-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Angel Coal Company Inc → Krissey No 1 Mine1; 1992-10-01 to 1994-10-12; source msha-controller-operator-history
- **controller_controls_mine:** White H D → Krissey No 1 Mine1; 1992-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** White H D → Angel Coal Company Inc; 1992-10-01 to 1994-10-12; source msha-controller-operator-history
- **operator_operates_mine:** Pitt-Fair Coal Company Inc → Krissey No 1 Mine1; 1994-10-13 to 1995-09-14; source msha-controller-operator-history
- **controller_controls_mine:** Nancy J  Richards et al → Krissey No 1 Mine1; 1994-10-13 to 1995-09-14; source msha-controller-operator-history
- **controller_controls_operator:** Nancy J  Richards et al → Pitt-Fair Coal Company Inc; 1994-10-13 to 1995-09-14; source msha-controller-operator-history
- **operator_operates_mine:** Twin Hills Mining Inc → Krissey No 1 Mine1; 1995-09-15 to 1998-07-14; source msha-controller-operator-history
- **controller_controls_mine:** Steve  Havrilesko → Krissey No 1 Mine1; 1995-09-15 to 1998-07-14; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Havrilesko → Twin Hills Mining Inc; 1995-09-15 to 1998-07-14; source msha-controller-operator-history
- **operator_operates_mine:** Brock Mining Inc → Krissey No 1 Mine1; 1998-07-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brock Mining Inc → Brock Mining Inc; 1998-07-15 to current/open; source msha-controller-operator-history