# Relationship history for MSHA mine 1101810

Current hierarchy: **Ron J  Bright → Quarter Construction Company → Clouse Sand & 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:** Clouse Sand & Gravel → Clouse Sand & Gravel; 1950-01-01 to 1988-08-10; source msha-controller-operator-history
- **controller_controls_mine:** Darrell  Clouse → Clouse Sand & Gravel; 1950-01-01 to 1988-08-10; source msha-controller-operator-history
- **controller_controls_operator:** Darrell  Clouse → Clouse Sand & Gravel; 1950-01-01 to 1988-08-10; source msha-controller-operator-history
- **operator_operates_mine:** Litwiller Sand & Gravel → Clouse Sand & Gravel; 1988-08-11 to 1990-06-04; source msha-controller-operator-history
- **controller_controls_mine:** Clifford  Litwiller → Clouse Sand & Gravel; 1988-08-11 to 1990-06-04; source msha-controller-operator-history
- **controller_controls_operator:** Clifford  Litwiller → Litwiller Sand & Gravel; 1988-08-11 to 1990-06-04; source msha-controller-operator-history
- **operator_operates_mine:** Quarter Construction Company → Clouse Sand & Gravel; 1990-06-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ron J  Bright → Clouse Sand & Gravel; 1990-06-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ron J  Bright → Quarter Construction Company; 1990-06-05 to current/open; source msha-controller-operator-history