# Relationship history for MSHA mine 3901642

Current hierarchy: **Ryan W Winter; William A Winter → WINTER INC → ELKTON EXIT 1**

- 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:** WINTER INC → ELKTON EXIT 1; 2019-08-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William A Winter et al → ELKTON EXIT 1; 2019-08-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William A Winter et al → WINTER INC; 2019-08-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ryan W Winter et al → WINTER INC; 2019-08-30 to current/open; source msha-controller-operator-history