# Relationship history for MSHA mine 3401482

Current hierarchy: **Barney U  Brown → B F D Mining Company Llc → SAND DOLLAR**

- 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:** Sooner Sand Plant Inc → SAND DOLLAR; 1985-03-01 to 1986-05-07; source msha-controller-operator-history
- **controller_controls_mine:** Orval C  White → SAND DOLLAR; 1985-03-01 to 1986-05-07; source msha-controller-operator-history
- **controller_controls_operator:** Orval C  White → Sooner Sand Plant Inc; 1985-03-01 to 1986-05-07; source msha-controller-operator-history
- **operator_operates_mine:** Sooner Sand Plant Inc → SAND DOLLAR; 1986-05-08 to 1992-09-23; source msha-controller-operator-history
- **controller_controls_mine:** Roy L  Armstrong → SAND DOLLAR; 1986-05-08 to 1992-09-23; source msha-controller-operator-history
- **controller_controls_operator:** Roy L  Armstrong → Sooner Sand Plant Inc; 1986-05-08 to 1992-09-23; source msha-controller-operator-history
- **operator_operates_mine:** Triangle Sand Inc → SAND DOLLAR; 1992-09-24 to 1993-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Eugene H  Brown → SAND DOLLAR; 1992-09-24 to 1993-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Eugene H  Brown → Triangle Sand Inc; 1992-09-24 to 1993-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Sooner Sand Mine Inc → SAND DOLLAR; 1993-07-01 to 1996-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Rick  Wheeler → SAND DOLLAR; 1993-07-01 to 1996-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Rick  Wheeler → Sooner Sand Mine Inc; 1993-07-01 to 1996-05-31; source msha-controller-operator-history
- **operator_operates_mine:** B F D Mining Company Llc → SAND DOLLAR; 1996-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Barney U  Brown → SAND DOLLAR; 1996-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Barney U  Brown → B F D Mining Company Llc; 1996-06-01 to current/open; source msha-controller-operator-history