# Relationship history for MSHA mine 4202403

Current hierarchy: **Alex D  Johnson → J & S Materials → Cedar Stone 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Taurus Plumbing & Excavating, Inc. → Cedar Stone Gravel Pit; 2005-03-07 to 2018-06-07; source msha-controller-operator-history
- **controller_controls_mine:** Alex D  Johnson → Cedar Stone Gravel Pit; 2005-03-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alex D  Johnson → Taurus Plumbing & Excavating, Inc.; 2005-03-07 to 2018-06-07; source msha-controller-operator-history
- **operator_operates_mine:** J & S Materials → Cedar Stone Gravel Pit; 2018-06-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Alex D  Johnson → Cedar Stone Gravel Pit; 2018-06-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alex D  Johnson → J & S Materials; 2018-06-08 to current/open; source msha-controller-operator-history