# Relationship history for MSHA mine 1512329

Current hierarchy: **Hughes Curtis → Old Time Energy 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

- **operator_operates_mine:** Old Time Energy Inc → No 1 Mine; 1980-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hughes Curtis → No 1 Mine; 1980-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hughes Curtis → Old Time Energy Inc; 1980-05-01 to current/open; source msha-controller-operator-history