# Relationship history for MSHA mine 3503895

Current hierarchy: **Albert  Shirk; Kelli  Fisher → Spring Butte Rock, LLC. → Spring Butte Rock**

- 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:** Spring Butte Rock, LLC. → Spring Butte Rock; 2019-11-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Albert  Shirk et al → Spring Butte Rock; 2019-11-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Albert  Shirk et al → Spring Butte Rock, LLC.; 2019-11-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kelli  Fisher et al → Spring Butte Rock, LLC.; 2019-11-08 to current/open; source msha-controller-operator-history