# Relationship history for MSHA mine 4502798

Current hierarchy: **Bowers Edgar C → Interstate Asphalt Company Inc → State Pit Ps-H-128**

- 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

- **controller_controls_mine:** Bowers Edgar C → State Pit Ps-H-128; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael P  Shaw → State Pit Ps-H-128; 1979-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Puget Sound Surfacers Inc → State Pit Ps-H-128; 1980-04-01 to 1981-02-10; source msha-controller-operator-history
- **controller_controls_operator:** Michael P  Shaw → Puget Sound Surfacers Inc; 1980-04-01 to 1981-02-10; source msha-controller-operator-history
- **operator_operates_mine:** Interstate Asphalt Company Inc → State Pit Ps-H-128; 1981-02-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bowers Edgar C → Interstate Asphalt Company Inc; 1981-02-11 to current/open; source msha-controller-operator-history