# Relationship history for MSHA mine 1506350

Current hierarchy: **John Mitch Potter → Coal Mac Inc → Coal-Mac Iii Tipple**

- 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:** Hawkins Coal Company → Coal-Mac Iii Tipple; 1950-01-01 to 1995-06-27; source msha-controller-operator-history
- **controller_controls_mine:** Henderson  Hawkins et al → Coal-Mac Iii Tipple; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Henderson  Hawkins et al → Hawkins Coal Company; 1950-01-01 to 1995-06-27; source msha-controller-operator-history
- **controller_controls_mine:** Ashland Inc et al → Coal-Mac Iii Tipple; 1989-10-19 to 1997-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Coal Mac Inc → Coal-Mac Iii Tipple; 1995-06-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc et al → Coal Mac Inc; 1995-06-28 to 1997-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Arch Resources Inc → Coal-Mac Iii Tipple; 1997-07-01 to 2019-10-22; source msha-controller-operator-history
- **controller_controls_operator:** Arch Resources Inc → Coal Mac Inc; 1997-07-01 to 2019-10-22; source msha-controller-operator-history
- **controller_controls_mine:** John Mitch Potter → Coal-Mac Iii Tipple; 2019-10-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John Mitch Potter → Coal Mac Inc; 2019-10-23 to current/open; source msha-controller-operator-history