# Relationship history for MSHA mine 2401638

Current hierarchy: **Mc Donald John W (Pat) → Mc Donald Mining & Milling → Mc Donald Mill**

- 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:** Mc Donald & Heisdorf Mining & Milling → Mc Donald Mill; 1981-06-01 to 1988-10-03; source msha-controller-operator-history
- **controller_controls_mine:** Mc Donald Pat & Joe Heisdorf → Mc Donald Mill; 1981-06-01 to 1988-10-03; source msha-controller-operator-history
- **controller_controls_operator:** Mc Donald Pat & Joe Heisdorf → Mc Donald & Heisdorf Mining & Milling; 1981-06-01 to 1988-10-03; source msha-controller-operator-history
- **controller_controls_mine:** Mc Donald John W (Pat) → Mc Donald Mill; 1986-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mc Donald Mining & Milling → Mc Donald Mill; 1988-10-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mc Donald John W (Pat) → Mc Donald Mining & Milling; 1988-10-04 to current/open; source msha-controller-operator-history