# Relationship history for MSHA mine 3607474

Current hierarchy: **Timothy M  Hoover → HOOVER STONE QUARRY LLC → HOOVER STONE QUARRY LLC**

- 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

- **controller_controls_mine:** M Carl  Hoover → HOOVER STONE QUARRY LLC; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hoover Quarry → HOOVER STONE QUARRY LLC; 1983-06-01 to 1993-03-31; source msha-controller-operator-history
- **controller_controls_operator:** M Carl  Hoover → Hoover Quarry; 1983-06-01 to 1993-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Hoover Stone Quarry LLC → HOOVER STONE QUARRY LLC; 1993-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Timothy M  Hoover → HOOVER STONE QUARRY LLC; 1993-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Timothy M  Hoover → Hoover Stone Quarry LLC; 1993-04-01 to current/open; source msha-controller-operator-history