# Relationship history for MSHA mine 1202044

Current hierarchy: **Greg  Olinger → United Minerals Inc → Mallard Marsh**

- 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:** Greg  Olinger → Mallard Marsh; 1979-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** United Minerals Inc → Mallard Marsh; 1988-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Greg  Olinger → United Minerals Inc; 1988-12-01 to current/open; source msha-controller-operator-history