# Relationship history for MSHA mine 4608519

Current hierarchy: **Robertson David → Deep Ford Mining Company Inc → No 2**

- 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:** Robertson David → No 2; 1994-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** S & R Mining Inc → No 2; 1995-08-01 to 1996-08-11; source msha-controller-operator-history
- **controller_controls_mine:** Sam  Coakley → No 2; 1995-08-01 to 1996-08-11; source msha-controller-operator-history
- **controller_controls_operator:** Sam  Coakley → S & R Mining Inc; 1995-08-01 to 1996-08-11; source msha-controller-operator-history
- **operator_operates_mine:** Deep Ford Mining Company Inc → No 2; 1996-08-12 to 1996-09-09; source msha-controller-operator-history
- **controller_controls_operator:** Robertson David → Deep Ford Mining Company Inc; 1996-08-12 to 1996-09-09; source msha-controller-operator-history
- **operator_operates_mine:** Typical Enterprises Inc → No 2; 1996-09-10 to 1996-11-17; source msha-controller-operator-history
- **controller_controls_mine:** Tackett Roger L → No 2; 1996-09-10 to 1996-11-17; source msha-controller-operator-history
- **controller_controls_operator:** Tackett Roger L → Typical Enterprises Inc; 1996-09-10 to 1996-11-17; source msha-controller-operator-history
- **operator_operates_mine:** Deep Ford Mining Company Inc → No 2; 1996-11-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robertson David → Deep Ford Mining Company Inc; 1996-11-18 to current/open; source msha-controller-operator-history