# Relationship history for MSHA mine 1200087

Current hierarchy: **Critser Gus → Rensselaer Stone Company Inc → Rensselaer Stone Company**

- 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:** A Metz Inc → Rensselaer Stone Company; 1950-01-01 to 1984-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Metz Donald A → Rensselaer Stone Company; 1950-01-01 to 1984-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Metz Donald A → A Metz Inc; 1950-01-01 to 1984-07-09; source msha-controller-operator-history
- **operator_operates_mine:** Rensselaer Stone Company Inc → Rensselaer Stone Company; 1984-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Critser Gus → Rensselaer Stone Company; 1984-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Critser Gus → Rensselaer Stone Company Inc; 1984-07-10 to current/open; source msha-controller-operator-history