# Relationship history for MSHA mine 4001303

Current hierarchy: **Viking Coal Limited Inc → Viking Coal Limited Inc → No 1 Surface 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:** P & L Coal Company → No 1 Surface Mine; 1973-01-01 to 1975-01-15; source msha-controller-operator-history
- **controller_controls_mine:** Pack Johnny → No 1 Surface Mine; 1973-01-01 to 1975-01-15; source msha-controller-operator-history
- **controller_controls_operator:** Pack Johnny → P & L Coal Company; 1973-01-01 to 1975-01-15; source msha-controller-operator-history
- **operator_operates_mine:** Viking Coal Limited Inc → No 1 Surface Mine; 1975-01-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Viking Coal Limited Inc → No 1 Surface Mine; 1975-01-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Viking Coal Limited Inc → Viking Coal Limited Inc; 1975-01-16 to current/open; source msha-controller-operator-history