# Relationship history for MSHA mine 2301053

Current hierarchy: **Colas S A → Brown Sand & Gravel → Brown Sand & Gravel- Shook 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Seminole Ag Lime Inc → Brown Sand & Gravel- Shook Quarry; 1950-01-01 to 1999-08-19; source msha-controller-operator-history
- **controller_controls_mine:** Billie  Harty → Brown Sand & Gravel- Shook Quarry; 1950-01-01 to 1999-08-19; source msha-controller-operator-history
- **controller_controls_operator:** Billie  Harty → Seminole Ag Lime Inc; 1950-01-01 to 1999-08-19; source msha-controller-operator-history
- **controller_controls_mine:** Colas S A → Brown Sand & Gravel- Shook Quarry; 1999-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Seminole Stone Inc → Brown Sand & Gravel- Shook Quarry; 1999-08-20 to 2006-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Joseph R  Knies → Brown Sand & Gravel- Shook Quarry; 1999-08-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joseph R  Knies → Seminole Stone Inc; 1999-08-20 to 2006-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Brown Sand & Gravel → Brown Sand & Gravel- Shook Quarry; 2006-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Colas S A → Brown Sand & Gravel; 2006-11-01 to current/open; source msha-controller-operator-history