# Relationship history for MSHA mine 2500025

Current hierarchy: **Becker Ray → Becker Quarry Company → Becker Quarry**

- 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:** United Rock Construction Inc → Becker Quarry; 1950-01-01 to 1979-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Myers Harold S → Becker Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Myers Harold S → United Rock Construction Inc; 1950-01-01 to 1979-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Becker Quarry Company → Becker Quarry; 1980-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Becker Ray → Becker Quarry; 1980-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Becker Ray → Becker Quarry Company; 1980-01-01 to current/open; source msha-controller-operator-history