# Relationship history for MSHA mine 3500135

Current hierarchy: **Mary Lou  Garrett → W W D Corp → BEAR CREEK 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** W W D Corp → BEAR CREEK QUARRY; 1950-01-01 to 1979-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Charles  Clayborn → BEAR CREEK QUARRY; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles  Clayborn → W W D Corp; 1950-01-01 to 1979-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Charles W  Royers → BEAR CREEK QUARRY; 1978-03-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Charles Royers Company → BEAR CREEK QUARRY; 1979-08-01 to 1986-09-29; source msha-controller-operator-history
- **controller_controls_operator:** Charles W  Royers → Charles Royers Company; 1979-08-01 to 1986-09-29; source msha-controller-operator-history
- **operator_operates_mine:** W W D Corp → BEAR CREEK QUARRY; 1986-09-30 to 1991-06-09; source msha-controller-operator-history
- **controller_controls_operator:** Charles  Clayborn → W W D Corp; 1986-09-30 to 1991-06-09; source msha-controller-operator-history
- **operator_operates_mine:** W W D Corp → BEAR CREEK QUARRY; 1991-06-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mary Lou  Garrett → BEAR CREEK QUARRY; 1991-06-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mary Lou  Garrett → W W D Corp; 1991-06-10 to current/open; source msha-controller-operator-history