# Relationship history for MSHA mine 4801422

Current hierarchy: **Brad  Cundy → Reeves → PORTABLE #1**

- 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:** Al Johnson Construction Company → PORTABLE #1; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Reeves Inc → PORTABLE #1; 1985-02-01 to 2000-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Al Johnson Construction Company → Reeves Inc; 1985-02-01 to 2000-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Reeves → PORTABLE #1; 2000-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brad  Cundy → PORTABLE #1; 2000-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brad  Cundy → Reeves; 2000-09-01 to current/open; source msha-controller-operator-history