# Relationship history for MSHA mine 5001181

Current hierarchy: **Richard  Standerfer → South Coast Inc → Labouchere Bay**

- 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:** Robertson Enterprises → Labouchere Bay; 1950-01-01 to 1979-04-18; source msha-controller-operator-history
- **controller_controls_mine:** Robertson Norm → Labouchere Bay; 1950-01-01 to 1979-04-18; source msha-controller-operator-history
- **controller_controls_operator:** Robertson Norm → Robertson Enterprises; 1950-01-01 to 1979-04-18; source msha-controller-operator-history
- **operator_operates_mine:** South Coast Inc → Labouchere Bay; 1979-04-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Richard  Standerfer → Labouchere Bay; 1979-04-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard  Standerfer → South Coast Inc; 1979-04-19 to current/open; source msha-controller-operator-history