# Relationship history for MSHA mine 1511796

Current hierarchy: **Isaac Basil → Isaac Coal Company Inc → No 3 Mine**

- 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

- **controller_controls_mine:** Isaac Basil → No 3 Mine; 1978-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Isaac Coal Company Inc → No 3 Mine; 1979-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Isaac Basil → Isaac Coal Company Inc; 1979-03-01 to current/open; source msha-controller-operator-history