# Relationship history for MSHA mine 4604043

Current hierarchy: **United  Company → Zapata Coal Corp → Betty 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** United  Company → Betty Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Zapata Corp → Betty Mine; 1950-01-01 to 1978-01-31; source msha-controller-operator-history
- **operator_operates_mine:** Zapata Coal Corp → Betty Mine; 1974-01-01 to 1978-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Zapata Corp → Zapata Coal Corp; 1974-01-01 to 1978-01-31; source msha-controller-operator-history
- **operator_operates_mine:** Zapata Coal Corp → Betty Mine; 1978-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** United  Company → Zapata Coal Corp; 1978-02-01 to current/open; source msha-controller-operator-history