# Relationship history for MSHA mine 0301139

Current hierarchy: **Haddox Lamar → Lamar Haddox Contractor Inc → Portable Crusher #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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Fairchild Gravel Company → Portable Crusher #1; 1950-01-01 to 1985-09-09; source msha-controller-operator-history
- **controller_controls_mine:** Fairchild J W → Portable Crusher #1; 1950-01-01 to 1985-09-09; source msha-controller-operator-history
- **controller_controls_operator:** Fairchild J W → Fairchild Gravel Company; 1950-01-01 to 1985-09-09; source msha-controller-operator-history
- **controller_controls_mine:** Haddox Lamar → Portable Crusher #1; 1985-09-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lamar Haddox Contractor Inc → Portable Crusher #1; 1985-09-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Haddox Lamar → Lamar Haddox Contractor Inc; 1985-09-10 to current/open; source msha-controller-operator-history