# Relationship history for MSHA mine 0301375

Current hierarchy: **Eugene W  Ibison Sr → Hackett Stone → HACKETT PIT**

- 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

- **operator_operates_mine:** Hackett Stone Quarry → HACKETT PIT; 1950-01-01 to 1994-11-02; source msha-controller-operator-history
- **controller_controls_mine:** Eugene W  Ibison Sr → HACKETT PIT; 1950-01-01 to 1994-11-02; source msha-controller-operator-history
- **controller_controls_operator:** Eugene W  Ibison Sr → Hackett Stone Quarry; 1950-01-01 to 1994-11-02; source msha-controller-operator-history
- **controller_controls_mine:** Eugene W  Ibison Sr → HACKETT PIT; 1991-05-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hackett Building Stone → HACKETT PIT; 1994-11-03 to 1996-03-18; source msha-controller-operator-history
- **controller_controls_mine:** Mark  Ibison  et al → HACKETT PIT; 1994-11-03 to 1996-03-18; source msha-controller-operator-history
- **controller_controls_operator:** Mark  Ibison  et al → Hackett Building Stone; 1994-11-03 to 1996-03-18; source msha-controller-operator-history
- **operator_operates_mine:** Hackett Stone → HACKETT PIT; 1996-03-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eugene W  Ibison Sr → Hackett Stone; 1996-03-19 to current/open; source msha-controller-operator-history