# Relationship history for MSHA mine 1505421

Current hierarchy: **James W  Potter → Potter Mining Company Inc → Potter No 8-C 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Potter Mining Company Inc → Potter No 8-C Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James W  Potter et al → Potter No 8-C Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James W  Potter et al → Potter Mining Company Inc; 1950-01-01 to current/open; source msha-controller-operator-history