# Relationship history for MSHA mine 0503583

Current hierarchy: **Riley Laura Frances → Laura Frances Riley → Nevada 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:** Donald Timney → Nevada Mine; 1980-09-01 to 1983-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Timney Donald → Nevada Mine; 1980-09-01 to 1983-11-15; source msha-controller-operator-history
- **controller_controls_operator:** Timney Donald → Donald Timney; 1980-09-01 to 1983-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Laura Frances Riley → Nevada Mine; 1983-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Riley Laura Frances → Nevada Mine; 1983-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Riley Laura Frances → Laura Frances Riley; 1983-11-16 to current/open; source msha-controller-operator-history