# Relationship history for MSHA mine 2302013

Current hierarchy: **Justin R  Dudenhoeffer → Mantle Mining Company → LANGENBERG/HEIDEL**

- 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:** Justin R  Dudenhoeffer → LANGENBERG/HEIDEL; 1979-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mantle Mining Company → LANGENBERG/HEIDEL; 1990-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Justin R  Dudenhoeffer → Mantle Mining Company; 1990-01-01 to current/open; source msha-controller-operator-history