# Relationship history for MSHA mine 1102727

Current hierarchy: **Zellmer Henry → Henry Zellmer Enterprises → Chiado Gravel 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Chiado Gravel Company → Chiado Gravel Company; 1980-03-01 to 1980-10-14; source msha-controller-operator-history
- **controller_controls_mine:** Chiado Tom → Chiado Gravel Company; 1980-03-01 to 1980-10-14; source msha-controller-operator-history
- **controller_controls_operator:** Chiado Tom → Chiado Gravel Company; 1980-03-01 to 1980-10-14; source msha-controller-operator-history
- **operator_operates_mine:** Henry Zellmer Enterprises → Chiado Gravel Company; 1980-10-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Zellmer Henry → Chiado Gravel Company; 1980-10-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Zellmer Henry → Henry Zellmer Enterprises; 1980-10-15 to current/open; source msha-controller-operator-history