# Relationship history for MSHA mine 3610127

Current hierarchy: **Chris E  Kerstetter → Big Mountain Anthracite → Big Mountain Anthracite #1 Pit**

- 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:** Big Mountain Anthracite → Big Mountain Anthracite #1 Pit; 2014-10-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Chris E  Kerstetter → Big Mountain Anthracite #1 Pit; 2014-10-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chris E  Kerstetter → Big Mountain Anthracite; 2014-10-29 to current/open; source msha-controller-operator-history