# Relationship history for MSHA mine 3400800

Current hierarchy: **Grider Joe A → Warbonnet Sand Company → Warbonnet Dredge**

- 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:** Okie Sand Company → Warbonnet Dredge; 1950-01-01 to 1981-07-28; source msha-controller-operator-history
- **controller_controls_mine:** Williams Buford → Warbonnet Dredge; 1950-01-01 to 1981-07-28; source msha-controller-operator-history
- **controller_controls_operator:** Williams Buford → Okie Sand Company; 1950-01-01 to 1981-07-28; source msha-controller-operator-history
- **operator_operates_mine:** Okie Sand Company → Warbonnet Dredge; 1981-07-29 to 1982-05-20; source msha-controller-operator-history
- **controller_controls_mine:** Burleson Arnold → Warbonnet Dredge; 1981-07-29 to 1982-05-20; source msha-controller-operator-history
- **controller_controls_operator:** Burleson Arnold → Okie Sand Company; 1981-07-29 to 1982-05-20; source msha-controller-operator-history
- **operator_operates_mine:** Popeye Sand & Gravel Company → Warbonnet Dredge; 1982-05-21 to 1984-07-22; source msha-controller-operator-history
- **controller_controls_mine:** Popejoy William Et Al → Warbonnet Dredge; 1982-05-21 to 1984-07-22; source msha-controller-operator-history
- **controller_controls_operator:** Popejoy William Et Al → Popeye Sand & Gravel Company; 1982-05-21 to 1984-07-22; source msha-controller-operator-history
- **operator_operates_mine:** Sense Sand & Rock Inc → Warbonnet Dredge; 1984-07-23 to 1986-04-17; source msha-controller-operator-history
- **controller_controls_mine:** Sense John J → Warbonnet Dredge; 1984-07-23 to 1986-04-17; source msha-controller-operator-history
- **controller_controls_operator:** Sense John J → Sense Sand & Rock Inc; 1984-07-23 to 1986-04-17; source msha-controller-operator-history
- **operator_operates_mine:** Okie Sand & Rock Company → Warbonnet Dredge; 1986-04-18 to 1990-04-15; source msha-controller-operator-history
- **controller_controls_mine:** Williams Buford → Warbonnet Dredge; 1986-04-18 to 1990-04-15; source msha-controller-operator-history
- **controller_controls_operator:** Williams Buford → Okie Sand & Rock Company; 1986-04-18 to 1990-04-15; source msha-controller-operator-history
- **operator_operates_mine:** Warbonnet Sand Company → Warbonnet Dredge; 1990-04-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Grider Joe A → Warbonnet Dredge; 1990-04-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Grider Joe A → Warbonnet Sand Company; 1990-04-16 to current/open; source msha-controller-operator-history