# Relationship history for MSHA mine 2500532

Current hierarchy: **Bradley  Wiese → Brad's Sand & Gravel → Brad's Sand and Gravel**

- 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:** Pettit Sand & Gravel → Brad's Sand and Gravel; 1950-01-01 to 1990-05-13; source msha-controller-operator-history
- **controller_controls_mine:** Floyd I Pettit → Brad's Sand and Gravel; 1950-01-01 to 1990-05-13; source msha-controller-operator-history
- **controller_controls_operator:** Floyd I Pettit → Pettit Sand & Gravel; 1950-01-01 to 1990-05-13; source msha-controller-operator-history
- **operator_operates_mine:** Brad's Sand & Gravel → Brad's Sand and Gravel; 1990-05-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bradley  Wiese → Brad's Sand and Gravel; 1990-05-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bradley  Wiese → Brad's Sand & Gravel; 1990-05-14 to current/open; source msha-controller-operator-history