# Relationship history for MSHA mine 4404464

Current hierarchy: **Potter Billy D & Jimmy R Dotson → Potter & Dotson Coal Company Inc → 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:** Potter & Dotson Coal Company Inc → No 1 Mine; 1976-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Potter Billy D & Jimmy R Dotson → No 1 Mine; 1976-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Potter Billy D & Jimmy R Dotson → Potter & Dotson Coal Company Inc; 1976-06-01 to current/open; source msha-controller-operator-history