# Relationship history for MSHA mine 1514216

Current hierarchy: **Rick Coal Company → Rick 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

- **operator_operates_mine:** Tracy Mining Company → No 1 Mine; 1983-09-01 to 1983-09-19; source msha-controller-operator-history
- **controller_controls_mine:** Gray Donald Et Al → No 1 Mine; 1983-09-01 to 1983-09-19; source msha-controller-operator-history
- **controller_controls_operator:** Gray Donald Et Al → Tracy Mining Company; 1983-09-01 to 1983-09-19; source msha-controller-operator-history
- **operator_operates_mine:** Rick Coal Company → No 1 Mine; 1983-09-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rick Coal Company → No 1 Mine; 1983-09-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rick Coal Company → Rick Coal Company; 1983-09-20 to current/open; source msha-controller-operator-history