# Relationship history for MSHA mine 1517348

Current hierarchy: **Skaggs Wallace → Skaggs & Skaggs Construction → Skaggs Shale Pit**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Skaggs & Skaggs Construction → Skaggs Shale Pit; 1993-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Skaggs Wallace → Skaggs Shale Pit; 1993-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Skaggs Wallace → Skaggs & Skaggs Construction; 1993-01-01 to current/open; source msha-controller-operator-history