# Relationship history for MSHA mine 4703263

Current hierarchy: **Russ  Stoller → Frank Stoller Construction Inc → POWERSCREEN**

- 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

- **controller_controls_mine:** Russ  Stoller → POWERSCREEN; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Frank Stoller Construction Inc → POWERSCREEN; 2001-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Russ  Stoller → Frank Stoller Construction Inc; 2001-05-01 to current/open; source msha-controller-operator-history