# Relationship history for MSHA mine 2402060

Current hierarchy: **Wm Dewey  Skelton → S K Construction Inc → PUGMILL**

- 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:** S K Construction Inc → PUGMILL; 1994-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wm Dewey  Skelton → PUGMILL; 1994-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wm Dewey  Skelton → S K Construction Inc; 1994-07-01 to current/open; source msha-controller-operator-history