# Relationship history for MSHA mine 1514261

Current hierarchy: **Gray Ancil → G & G Coal & Equipment Company Inc → No 1**

- 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:** J & L Coal Company → No 1; 1983-09-01 to 1985-10-28; source msha-controller-operator-history
- **controller_controls_mine:** Collinsworth Jerry-Jimmy Engle Et Al → No 1; 1983-09-01 to 1985-10-28; source msha-controller-operator-history
- **controller_controls_operator:** Collinsworth Jerry-Jimmy Engle Et Al → J & L Coal Company; 1983-09-01 to 1985-10-28; source msha-controller-operator-history
- **controller_controls_mine:** Gray Ancil Et Al → No 1; 1985-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** G & G Coal & Equipment Company Inc → No 1; 1985-10-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gray Ancil Et Al → G & G Coal & Equipment Company Inc; 1985-10-29 to current/open; source msha-controller-operator-history