# Relationship history for MSHA mine 5001976

Current hierarchy: **Doug  Baker → Landview Excavating, Inc → Mastadon Creek**

- 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

- **operator_operates_mine:** Landview Excavating, Inc → Mastadon Creek; 2012-04-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Doug  Baker et al → Mastadon Creek; 2012-04-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Doug  Baker et al → Landview Excavating, Inc; 2012-04-11 to current/open; source msha-controller-operator-history