# Relationship history for MSHA mine 0100170

Current hierarchy: **Doss S D → High Wall Coal Company Inc → Highwall 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

- **operator_operates_mine:** Mahaffey Coal Company → Highwall Mine; 1950-01-01 to 1971-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Mahaffey Coal Co → Highwall Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mahaffey Coal Co → Mahaffey Coal Company; 1950-01-01 to 1971-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Robbins Coal Company → Highwall Mine; 1972-01-01 to 1974-01-02; source msha-controller-operator-history
- **controller_controls_mine:** Robbins Leroy → Highwall Mine; 1972-01-01 to 1974-01-02; source msha-controller-operator-history
- **controller_controls_operator:** Robbins Leroy → Robbins Coal Company; 1972-01-01 to 1974-01-02; source msha-controller-operator-history
- **operator_operates_mine:** Jones Coal Company → Highwall Mine; 1974-01-03 to 1974-02-01; source msha-controller-operator-history
- **controller_controls_mine:** Jones Coal Co → Highwall Mine; 1974-01-03 to 1974-02-01; source msha-controller-operator-history
- **controller_controls_operator:** Jones Coal Co → Jones Coal Company; 1974-01-03 to 1974-02-01; source msha-controller-operator-history
- **operator_operates_mine:** High Wall Coal Company Inc → Highwall Mine; 1974-02-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Doss S D → Highwall Mine; 1974-02-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Doss S D → High Wall Coal Company Inc; 1974-02-02 to current/open; source msha-controller-operator-history