# Relationship history for MSHA mine 3600226

Current hierarchy: **Timothy W Rohrer; Travis E Rohrer → Rohrer's Quarry Inc → ROHRERS QUARRY, INC.**

- 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:** Rohrer's Quarry Inc → ROHRERS QUARRY, INC.; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wilbur G  Rohrer → ROHRERS QUARRY, INC.; 1950-01-01 to 2024-06-23; source msha-controller-operator-history
- **controller_controls_operator:** Wilbur G  Rohrer → Rohrer's Quarry Inc; 1950-01-01 to 2024-06-23; source msha-controller-operator-history
- **controller_controls_mine:** Travis E Rohrer et al → ROHRERS QUARRY, INC.; 2024-06-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Travis E Rohrer et al → Rohrer's Quarry Inc; 2024-06-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Timothy W Rohrer et al → Rohrer's Quarry Inc; 2024-06-24 to current/open; source msha-controller-operator-history