# Relationship history for MSHA mine 1505065

Current hierarchy: **Hamilton Jack → Gale Coal Company Inc → No 1 Surface**

- 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:** Gale Coal Company Inc → No 1 Surface; 1950-01-01 to 1981-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Hamilton Jack → No 1 Surface; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hamilton Jack → Gale Coal Company Inc; 1950-01-01 to 1981-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Devils Branch Coal Corp → No 1 Surface; 1981-07-01 to 1987-08-09; source msha-controller-operator-history
- **controller_controls_mine:** Newsome Ken M → No 1 Surface; 1981-07-01 to 1987-08-09; source msha-controller-operator-history
- **controller_controls_operator:** Newsome Ken M → Devils Branch Coal Corp; 1981-07-01 to 1987-08-09; source msha-controller-operator-history
- **operator_operates_mine:** Gale Coal Company Inc → No 1 Surface; 1987-08-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hamilton Jack → Gale Coal Company Inc; 1987-08-10 to current/open; source msha-controller-operator-history