# Relationship history for MSHA mine 3002228

Current hierarchy: **Serafini N G → N G Serafini → Serafini Pit**

- 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:** Lane Construction Corp → Serafini Pit; 1950-01-01 to 1978-05-11; source msha-controller-operator-history
- **controller_controls_mine:** Lane Industries Inc → Serafini Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lane Industries Inc → Lane Construction Corp; 1950-01-01 to 1978-05-11; source msha-controller-operator-history
- **operator_operates_mine:** N G Serafini → Serafini Pit; 1978-05-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Serafini N G → Serafini Pit; 1978-05-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Serafini N G → N G Serafini; 1978-05-12 to current/open; source msha-controller-operator-history