# Relationship history for MSHA mine 1512295

Current hierarchy: **Holben Michael G → Blaze Coal Company Inc → Mine 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:** Preece Homer & George → Mine No 1; 1975-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Preece Coal Company Inc → Mine No 1; 1980-04-01 to 1984-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Preece Homer & George → Preece Coal Company Inc; 1980-04-01 to 1984-09-30; source msha-controller-operator-history
- **operator_operates_mine:** West Fork Coal Company → Mine No 1; 1984-10-01 to 1986-01-28; source msha-controller-operator-history
- **controller_controls_mine:** Coleman Dennis S → Mine No 1; 1984-10-01 to 1986-01-28; source msha-controller-operator-history
- **controller_controls_operator:** Coleman Dennis S → West Fork Coal Company; 1984-10-01 to 1986-01-28; source msha-controller-operator-history
- **operator_operates_mine:** J C London Coal Company Inc → Mine No 1; 1986-01-29 to 1991-05-30; source msha-controller-operator-history
- **controller_controls_mine:** Hale Harold C → Mine No 1; 1986-01-29 to 1991-05-30; source msha-controller-operator-history
- **controller_controls_operator:** Hale Harold C → J C London Coal Company Inc; 1986-01-29 to 1991-05-30; source msha-controller-operator-history
- **operator_operates_mine:** Blaze Coal Company Inc → Mine No 1; 1991-05-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Holben Michael G → Mine No 1; 1991-05-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holben Michael G → Blaze Coal Company Inc; 1991-05-31 to current/open; source msha-controller-operator-history