# Relationship history for MSHA mine 0102946

Current hierarchy: **Barringer David F → R & D Mining Inc → Lehigh Mine**

- 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:** Garrison James B → Lehigh Mine; 1989-07-01 to 1994-02-20; source msha-controller-operator-history
- **operator_operates_mine:** Bar Coal Inc → Lehigh Mine; 1992-02-01 to 1993-11-14; source msha-controller-operator-history
- **controller_controls_operator:** Garrison James B → Bar Coal Inc; 1992-02-01 to 1993-11-14; source msha-controller-operator-history
- **operator_operates_mine:** Etowah Rail & Salvage → Lehigh Mine; 1993-11-15 to 1994-11-01; source msha-controller-operator-history
- **controller_controls_mine:** Moore Charles B → Lehigh Mine; 1993-11-15 to 1994-11-01; source msha-controller-operator-history
- **controller_controls_operator:** Moore Charles B → Etowah Rail & Salvage; 1993-11-15 to 1994-11-01; source msha-controller-operator-history
- **operator_operates_mine:** R & D Mining Inc → Lehigh Mine; 1994-11-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Barringer David F → Lehigh Mine; 1994-11-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Barringer David F → R & D Mining Inc; 1994-11-02 to current/open; source msha-controller-operator-history