# Relationship history for MSHA mine 4607957

Current hierarchy: **Zuspan Velma G & Michael B Mc Cort → Valley Coal Corp → 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:** Zuspan Velma G & Michael B Mc Cort → No 1 Mine; 1977-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** B & R Company Inc → No 1 Mine; 1990-10-01 to 1992-10-06; source msha-controller-operator-history
- **controller_controls_mine:** Blankenship Rhonda → No 1 Mine; 1990-10-01 to 1992-10-06; source msha-controller-operator-history
- **controller_controls_operator:** Blankenship Rhonda → B & R Company Inc; 1990-10-01 to 1992-10-06; source msha-controller-operator-history
- **operator_operates_mine:** Valley Coal Corp → No 1 Mine; 1992-10-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Zuspan Velma G & Michael B Mc Cort → Valley Coal Corp; 1992-10-07 to current/open; source msha-controller-operator-history