# Relationship history for MSHA mine 4703310

Current hierarchy: **Sharyl L  Schlieckau → HOLTZ LIME, GRAVEL & EXCAVATING, INC. → PLANT #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:** HOLTZ LIME, GRAVEL & EXCAVATING, INC. → PLANT #1; 2002-05-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sharyl L  Schlieckau → PLANT #1; 2002-05-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sharyl L  Schlieckau → HOLTZ LIME, GRAVEL & EXCAVATING, INC.; 2002-05-20 to current/open; source msha-controller-operator-history