# Relationship history for MSHA mine 3610160

Current hierarchy: **Eric  Linde → E.R. Linde Construction → Montrose Crusher**

- 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

- **controller_controls_mine:** Eric  Linde et al → Montrose Crusher; 2002-04-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** E.R. Linde Construction → Montrose Crusher; 2015-10-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eric  Linde et al → E.R. Linde Construction; 2015-10-07 to current/open; source msha-controller-operator-history