# Relationship history for MSHA mine 4503857

Current hierarchy: **Robert  Dressel → Upper Peoh Pt Rd Rock Quarry, LLC → 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:** Upper Peoh Pt Rd Rock Quarry, LLC → Plant 1; 2025-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert  Dressel → Plant 1; 2025-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Dressel → Upper Peoh Pt Rd Rock Quarry, LLC; 2025-04-01 to current/open; source msha-controller-operator-history