# Relationship history for MSHA mine 4605670

Current hierarchy: **Jack  Kingsmill → P G & H Inc → No 4 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:** G A  Dunham → No 4 Mine; 1977-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** P G & H Inc → No 4 Mine; 1977-10-01 to 1987-12-31; source msha-controller-operator-history
- **controller_controls_operator:** G A  Dunham → P G & H Inc; 1977-10-01 to 1987-12-31; source msha-controller-operator-history
- **operator_operates_mine:** P G & H Inc → No 4 Mine; 1988-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jack  Kingsmill → No 4 Mine; 1988-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jack  Kingsmill → P G & H Inc; 1988-01-01 to current/open; source msha-controller-operator-history