# Relationship history for MSHA mine 4105104

Current hierarchy: **Douglas  Wehmeyer → Grape Creek Construction → Rode Mine Unit G20**

- 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:** Grape Creek Construction → Rode Mine Unit G20; 2015-01-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Douglas  Wehmeyer → Rode Mine Unit G20; 2015-01-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Douglas  Wehmeyer → Grape Creek Construction; 2015-01-14 to current/open; source msha-controller-operator-history