# Relationship history for MSHA mine 1513409

Current hierarchy: **James W  Potter → Potter Mining Company Inc → No C-21**

- 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:** James W  Potter et al → No C-21; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Williams Randy → No C-21; 1979-02-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Williams Brothers Coal Company Inc → No C-21; 1982-03-01 to 1983-07-18; source msha-controller-operator-history
- **controller_controls_operator:** Williams Randy → Williams Brothers Coal Company Inc; 1982-03-01 to 1983-07-18; source msha-controller-operator-history
- **operator_operates_mine:** Potter Mining Company Inc → No C-21; 1983-07-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James W  Potter et al → Potter Mining Company Inc; 1983-07-19 to current/open; source msha-controller-operator-history