# Relationship history for MSHA mine 3304083

Current hierarchy: **Carmeuse Holding SA → Osborne Materials Company → Lake Erie**

- 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:** Osborne Materials Company → Lake Erie; 1987-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jerome  Osborne et al → Lake Erie; 1987-03-01 to 2016-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Jerome  Osborne et al → Osborne Materials Company; 1987-03-01 to 2016-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Carmeuse Holding SA → Lake Erie; 2016-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carmeuse Holding SA → Osborne Materials Company; 2016-04-01 to current/open; source msha-controller-operator-history