# Relationship history for MSHA mine 1508991

Current hierarchy: **Johnson Elwood → T & J Coal Company Inc → 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:** D & H Coal Company → No 2 Mine; 1975-10-30 to 1976-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Anthony  Newsome → No 2 Mine; 1975-10-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Anthony  Newsome → D & H Coal Company; 1975-10-30 to 1976-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Johnson Elwood Et Al → No 2 Mine; 1976-11-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** T & J Coal Company Inc → No 2 Mine; 1977-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Johnson Elwood Et Al → T & J Coal Company Inc; 1977-01-01 to current/open; source msha-controller-operator-history