# Relationship history for MSHA mine 2002792

Current hierarchy: **Headwater Industries LLC → LRM Holdings LLC → LRM Concrete and Excavation Services**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Leelanau Redi-Mix Inc → LRM Concrete and Excavation Services; 1987-10-01 to 2021-04-15; source msha-controller-operator-history
- **controller_controls_mine:** Marilyn  Flaska → LRM Concrete and Excavation Services; 1987-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marilyn  Flaska → Leelanau Redi-Mix Inc; 1987-10-01 to 2021-04-15; source msha-controller-operator-history
- **operator_operates_mine:** LRM Holdings LLC → LRM Concrete and Excavation Services; 2021-04-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Headwater Industries LLC → LRM Concrete and Excavation Services; 2021-04-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Headwater Industries LLC → LRM Holdings LLC; 2021-04-16 to current/open; source msha-controller-operator-history