# Relationship history for MSHA mine 4703370

Current hierarchy: **Troy D  Piotrowski → Glacier Stone, Inc. → Glacier Stone, Inc.**

- 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:** Glacier Stone Inc. → Glacier Stone, Inc.; 2003-12-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Troy D  Piotrowski → Glacier Stone, Inc.; 2003-12-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Troy D  Piotrowski → Glacier Stone Inc.; 2003-12-09 to current/open; source msha-controller-operator-history