# Relationship history for MSHA mine 2002002

Current hierarchy: **Gary C  Shook Jr → Shook Asphalt Co., Inc. → Shook Gravel 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Shook Asphalt Company → Shook Gravel Pit; 1950-01-01 to 1993-04-01; source msha-controller-operator-history
- **controller_controls_mine:** Betty  Shook → Shook Gravel Pit; 1950-01-01 to 1993-04-01; source msha-controller-operator-history
- **controller_controls_operator:** Betty  Shook → Shook Asphalt Company; 1950-01-01 to 1993-04-01; source msha-controller-operator-history
- **operator_operates_mine:** Shook Asphalt Co., Inc. → Shook Gravel Pit; 1993-04-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gary C  Shook Jr → Shook Gravel Pit; 1993-04-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary C  Shook Jr → Shook Asphalt Co., Inc.; 1993-04-02 to current/open; source msha-controller-operator-history