# Relationship history for MSHA mine 3609061

Current hierarchy: **Eric  Linde → E R Linde Construction Corporation → Leeward Quarry**

- 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:** E R Linde Construction Corporation → Leeward Quarry; 2002-04-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Eric  Linde et al → Leeward Quarry; 2002-04-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eric  Linde et al → E R Linde Construction Corporation; 2002-04-02 to current/open; source msha-controller-operator-history