# Relationship history for MSHA mine 4605632

Current hierarchy: **Alexander Dave → Primrose Coal Inc → Melio 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

- **operator_operates_mine:** Melio Mining Company Inc → Melio Mine; 1977-10-01 to 1978-06-22; source msha-controller-operator-history
- **controller_controls_mine:** Kopnski Thomas → Melio Mine; 1977-10-01 to 1978-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Kopnski Thomas → Melio Mining Company Inc; 1977-10-01 to 1978-06-22; source msha-controller-operator-history
- **operator_operates_mine:** Primrose Coal Inc → Melio Mine; 1978-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Alexander Dave Et Al → Melio Mine; 1978-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alexander Dave Et Al → Primrose Coal Inc; 1978-06-23 to current/open; source msha-controller-operator-history