# Relationship history for MSHA mine 3606486

Current hierarchy: **Ciaffoni Orlando → Granbay Coal Company Inc → Cornell & Stuart Strips**

- 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:** Hamilton Coal & Clay Company Inc → Cornell & Stuart Strips; 1977-08-01 to 1982-05-23; source msha-controller-operator-history
- **controller_controls_mine:** Francis J  Hamilton et al → Cornell & Stuart Strips; 1977-08-01 to 1982-05-23; source msha-controller-operator-history
- **controller_controls_operator:** Francis J  Hamilton et al → Hamilton Coal & Clay Company Inc; 1977-08-01 to 1982-05-23; source msha-controller-operator-history
- **operator_operates_mine:** Granbay Coal Company Inc → Cornell & Stuart Strips; 1982-05-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ciaffoni Orlando → Cornell & Stuart Strips; 1982-05-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ciaffoni Orlando → Granbay Coal Company Inc; 1982-05-24 to current/open; source msha-controller-operator-history