# Relationship history for MSHA mine 4606576

Current hierarchy: **Mc Kenzie Jay R → N H M Inc → No 1 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:** Corder William R → No 1 Mine; 1975-01-01 to 1987-06-16; source msha-controller-operator-history
- **operator_operates_mine:** Duke Mining Inc → No 1 Mine; 1982-09-01 to 1983-03-20; source msha-controller-operator-history
- **controller_controls_operator:** Corder William R → Duke Mining Inc; 1982-09-01 to 1983-03-20; source msha-controller-operator-history
- **operator_operates_mine:** N H M Inc → No 1 Mine; 1983-03-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mc Kenzie Jay R → No 1 Mine; 1983-03-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mc Kenzie Jay R → N H M Inc; 1983-03-21 to current/open; source msha-controller-operator-history