# Relationship history for MSHA mine 3303259

Current hierarchy: **Frank  Waller → Briar Hill Stone Company → THE BRIAR HILL STONE CO.**

- 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:** Briar Hill Stone Company → THE BRIAR HILL STONE CO.; 1950-01-01 to 1988-01-12; source msha-controller-operator-history
- **controller_controls_mine:** R C  Bair → THE BRIAR HILL STONE CO.; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** R C  Bair → Briar Hill Stone Company; 1950-01-01 to 1988-01-12; source msha-controller-operator-history
- **operator_operates_mine:** Briar Hill Stone Company → THE BRIAR HILL STONE CO.; 1988-01-13 to 1992-05-17; source msha-controller-operator-history
- **controller_controls_mine:** Eugene G  Rosenthal → THE BRIAR HILL STONE CO.; 1988-01-13 to 1992-05-17; source msha-controller-operator-history
- **controller_controls_operator:** Eugene G  Rosenthal → Briar Hill Stone Company; 1988-01-13 to 1992-05-17; source msha-controller-operator-history
- **operator_operates_mine:** Briar Hill Stone Company → THE BRIAR HILL STONE CO.; 1992-05-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Frank  Waller → THE BRIAR HILL STONE CO.; 1992-05-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Frank  Waller → Briar Hill Stone Company; 1992-05-18 to current/open; source msha-controller-operator-history