# Relationship history for MSHA mine 3607122

Current hierarchy: **Pollick Stanley J → Stanley J Pollick → Pollick Strip**

- 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:** Stanley J Pollick → Pollick Strip; 1981-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Pollick Stanley J → Pollick Strip; 1981-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pollick Stanley J → Stanley J Pollick; 1981-04-01 to current/open; source msha-controller-operator-history