# Relationship history for MSHA mine 1102406

Current hierarchy: **Ribbe Dan → R & W Gravel Company Inc → COUNTY LINE PIT**

- 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:** Adkins Gravel → COUNTY LINE PIT; 1950-01-01 to 1985-05-02; source msha-controller-operator-history
- **controller_controls_mine:** Adkins Welby → COUNTY LINE PIT; 1950-01-01 to 1985-05-02; source msha-controller-operator-history
- **controller_controls_operator:** Adkins Welby → Adkins Gravel; 1950-01-01 to 1985-05-02; source msha-controller-operator-history
- **operator_operates_mine:** County Line Sand & Gravel Inc → COUNTY LINE PIT; 1985-05-03 to 1989-10-14; source msha-controller-operator-history
- **controller_controls_mine:** Beiser Donald G → COUNTY LINE PIT; 1985-05-03 to 1989-10-14; source msha-controller-operator-history
- **controller_controls_operator:** Beiser Donald G → County Line Sand & Gravel Inc; 1985-05-03 to 1989-10-14; source msha-controller-operator-history
- **controller_controls_mine:** Peter E  Powell → COUNTY LINE PIT; 1988-10-01 to 1993-01-14; source msha-controller-operator-history
- **operator_operates_mine:** Builders Sand Of Illinois Inc → COUNTY LINE PIT; 1989-10-15 to 1993-01-03; source msha-controller-operator-history
- **controller_controls_operator:** Peter E  Powell → Builders Sand Of Illinois Inc; 1989-10-15 to 1993-01-03; source msha-controller-operator-history
- **operator_operates_mine:** R & W Gravel Company Inc → COUNTY LINE PIT; 1993-01-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ribbe Dan → COUNTY LINE PIT; 1993-01-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ribbe Dan → R & W Gravel Company Inc; 1993-01-04 to current/open; source msha-controller-operator-history