# Relationship history for MSHA mine 3300176

Current hierarchy: **Frank  Waller → Briar Hill Stone Co → 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:** Waller Brothers Stone Company Inc → Briar Hill Stone Co; 1950-01-01 to 2006-09-04; source msha-controller-operator-history
- **controller_controls_mine:** Frank  Waller → Briar Hill Stone Co; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Frank  Waller → Waller Brothers Stone Company Inc; 1950-01-01 to 2006-09-04; source msha-controller-operator-history
- **controller_controls_mine:** Frank  Waller → Briar Hill Stone Co; 1992-05-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Scioto Sandstone LLC → Briar Hill Stone Co; 2006-09-05 to 2008-02-29; source msha-controller-operator-history
- **controller_controls_mine:** Lowell  Shope → Briar Hill Stone Co; 2006-09-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lowell  Shope → Scioto Sandstone LLC; 2006-09-05 to 2008-02-29; source msha-controller-operator-history
- **operator_operates_mine:** Briar Hill Stone Co → Briar Hill Stone Co; 2008-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Frank  Waller → Briar Hill Stone Co; 2008-03-01 to current/open; source msha-controller-operator-history