# Relationship history for MSHA mine 4601413

Current hierarchy: **Ted  Osborne → Gary Coal Sales Inc → No 4 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:** United States Steel Mining Company Inc → No 4 Mine; 1950-01-01 to 1988-09-15; source msha-controller-operator-history
- **controller_controls_mine:** Usx Corp → No 4 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Usx Corp → United States Steel Mining Company Inc; 1950-01-01 to 1988-09-15; source msha-controller-operator-history
- **operator_operates_mine:** Gary Coal Sales Inc → No 4 Mine; 1988-09-16 to 1993-07-14; source msha-controller-operator-history
- **controller_controls_mine:** Ted  Osborne  et al → No 4 Mine; 1988-09-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ted  Osborne  et al → Gary Coal Sales Inc; 1988-09-16 to 1993-07-14; source msha-controller-operator-history
- **operator_operates_mine:** Algoma Pocahontas Coal Inc → No 4 Mine; 1993-07-15 to 1994-07-17; source msha-controller-operator-history
- **controller_controls_mine:** Charles Robert B → No 4 Mine; 1993-07-15 to 1994-07-17; source msha-controller-operator-history
- **controller_controls_operator:** Charles Robert B → Algoma Pocahontas Coal Inc; 1993-07-15 to 1994-07-17; source msha-controller-operator-history
- **operator_operates_mine:** Gary Coal Sales Inc → No 4 Mine; 1994-07-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ted  Osborne  et al → Gary Coal Sales Inc; 1994-07-18 to current/open; source msha-controller-operator-history