# Relationship history for MSHA mine 1513728

Current hierarchy: **Cochran Gary & Danny → G & D Coal Company → No 1 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:** Hubbs Joe → No 1 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Black Spade Coal Company → No 1 Mine; 1982-09-01 to 1983-01-18; source msha-controller-operator-history
- **controller_controls_mine:** Thomas Ancil & T L Crabtree → No 1 Mine; 1982-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas Ancil & T L Crabtree → Black Spade Coal Company; 1982-09-01 to 1983-01-18; source msha-controller-operator-history
- **operator_operates_mine:** J & D Coal Company Inc → No 1 Mine; 1983-01-19 to 1983-08-17; source msha-controller-operator-history
- **controller_controls_operator:** Hubbs Joe → J & D Coal Company Inc; 1983-01-19 to 1983-08-17; source msha-controller-operator-history
- **operator_operates_mine:** B & C Trucking Company Inc → No 1 Mine; 1983-08-18 to 1986-11-13; source msha-controller-operator-history
- **controller_controls_mine:** Cochran Lloyd Et Al → No 1 Mine; 1983-08-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cochran Lloyd Et Al → B & C Trucking Company Inc; 1983-08-18 to 1986-11-13; source msha-controller-operator-history
- **operator_operates_mine:** G & D Coal Company → No 1 Mine; 1986-11-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cochran Gary & Danny → No 1 Mine; 1986-11-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cochran Gary & Danny → G & D Coal Company; 1986-11-14 to current/open; source msha-controller-operator-history