# Relationship history for MSHA mine 4703498

Current hierarchy: **Keith  Griesbach → Griesbach Construction Company → Griesbach's Plant**

- 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:** Griesbach Construction Company → Griesbach's Plant; 2007-03-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Keith  Griesbach → Griesbach's Plant; 2007-03-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Keith  Griesbach → Griesbach Construction Company; 2007-03-20 to current/open; source msha-controller-operator-history