# Relationship history for MSHA mine 0801100

Current hierarchy: **Johnson Alan N → Sea Con Industries Inc → Sanders Pit**

- 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:** Sea Con Industries Inc → Sanders Pit; 1988-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Johnson Alan N → Sanders Pit; 1988-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Johnson Alan N → Sea Con Industries Inc; 1988-05-01 to current/open; source msha-controller-operator-history