# Relationship history for MSHA mine 1507411

Current hierarchy: **Tacket Sylvan-Harold D & Ronnie → T R M Mining Company → No 2 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

- **operator_operates_mine:** R & R Coal Company Inc → No 2 Mine; 1974-11-01 to 1977-02-23; source msha-controller-operator-history
- **controller_controls_mine:** Robinson George D → No 2 Mine; 1974-11-01 to 1977-02-23; source msha-controller-operator-history
- **controller_controls_operator:** Robinson George D → R & R Coal Company Inc; 1974-11-01 to 1977-02-23; source msha-controller-operator-history
- **operator_operates_mine:** T & F Mining Company → No 2 Mine; 1977-02-24 to 1978-01-15; source msha-controller-operator-history
- **controller_controls_mine:** Stanley Fonso → No 2 Mine; 1977-02-24 to 1978-01-15; source msha-controller-operator-history
- **controller_controls_operator:** Stanley Fonso → T & F Mining Company; 1977-02-24 to 1978-01-15; source msha-controller-operator-history
- **operator_operates_mine:** T R M Mining Company → No 2 Mine; 1978-01-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tacket Sylvan-Harold D & Ronnie → No 2 Mine; 1978-01-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tacket Sylvan-Harold D & Ronnie → T R M Mining Company; 1978-01-16 to current/open; source msha-controller-operator-history