# Relationship history for MSHA mine 3401030

Current hierarchy: **Eugene W  Ibison Sr → Hackett Stone → SEC. 20 & 25**

- 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:** C & B Rocking Corp → SEC. 20 & 25; 1950-01-01 to 1979-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Triche R C → SEC. 20 & 25; 1950-01-01 to 1979-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Triche R C → C & B Rocking Corp; 1950-01-01 to 1979-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Woodruff'S Rocking Company → SEC. 20 & 25; 1979-10-01 to 1991-05-13; source msha-controller-operator-history
- **controller_controls_mine:** James  Woodruff et al → SEC. 20 & 25; 1979-10-01 to 1991-05-13; source msha-controller-operator-history
- **controller_controls_operator:** James  Woodruff et al → Woodruff'S Rocking Company; 1979-10-01 to 1991-05-13; source msha-controller-operator-history
- **operator_operates_mine:** Hackett Stone → SEC. 20 & 25; 1991-05-14 to 1995-01-23; source msha-controller-operator-history
- **controller_controls_mine:** Eugene W  Ibison Sr → SEC. 20 & 25; 1991-05-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eugene W  Ibison Sr → Hackett Stone; 1991-05-14 to 1995-01-23; source msha-controller-operator-history
- **operator_operates_mine:** Hackett Stone Of Oklahoma → SEC. 20 & 25; 1995-01-24 to 1996-01-01; source msha-controller-operator-history
- **controller_controls_mine:** Eugene W  Ibison Jr → SEC. 20 & 25; 1995-01-24 to 1996-01-01; source msha-controller-operator-history
- **controller_controls_operator:** Eugene W  Ibison Jr → Hackett Stone Of Oklahoma; 1995-01-24 to 1996-01-01; source msha-controller-operator-history
- **operator_operates_mine:** Hackett Stone → SEC. 20 & 25; 1996-01-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eugene W  Ibison Sr → Hackett Stone; 1996-01-02 to current/open; source msha-controller-operator-history