# Relationship history for MSHA mine 1518895

Current hierarchy: **Stephen W  Pleasant → Pleasant Excavating and Hauling → 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:** Pleasant Excavating and Hauling → No. 1 Mine; 2005-06-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stephen W  Pleasant → No. 1 Mine; 2005-06-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stephen W  Pleasant → Pleasant Excavating and Hauling; 2005-06-14 to current/open; source msha-controller-operator-history