# Relationship history for MSHA mine 4000549

Current hierarchy: **Tucker Joseph L → Phillips & Tucker Coal Company → No 6 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:** Gillentine Fred & Scotty Boldin → No 6 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Gay Coal Inc → No 6 Mine; 1950-01-01 to 1976-03-01; source msha-controller-operator-history
- **controller_controls_mine:** Owens Curtis → No 6 Mine; 1950-01-01 to 1977-01-06; source msha-controller-operator-history
- **controller_controls_operator:** Owens Curtis → Gay Coal Inc; 1950-01-01 to 1976-03-01; source msha-controller-operator-history
- **operator_operates_mine:** G & B Coal Company Inc → No 6 Mine; 1976-03-02 to 1976-09-14; source msha-controller-operator-history
- **controller_controls_operator:** Gillentine Fred & Scotty Boldin → G & B Coal Company Inc; 1976-03-02 to 1976-09-14; source msha-controller-operator-history
- **operator_operates_mine:** Phillips & Tucker Coal Company → No 6 Mine; 1976-09-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tucker Joseph L Et Al → No 6 Mine; 1976-09-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tucker Joseph L Et Al → Phillips & Tucker Coal Company; 1976-09-15 to current/open; source msha-controller-operator-history