# Relationship history for MSHA mine 3609997

Current hierarchy: **Jeffery S  Sisler → Ali Co. → Robena Surface Mine**

- 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:** Ali Co. → Robena Surface Mine; 2012-03-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jeffery S  Sisler → Robena Surface Mine; 2012-03-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeffery S  Sisler → Ali Co.; 2012-03-28 to current/open; source msha-controller-operator-history