# Relationship history for MSHA mine 3200949

Current hierarchy: **Randy  Byrum; Susan  Byrum → Antelope Creek Trucking, Inc. → Pit 1**

- 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:** Antelope Creek Trucking → Pit 1; 2012-04-04 to 2015-09-10; source msha-controller-operator-history
- **controller_controls_mine:** Ricky John  Helm et al → Pit 1; 2012-04-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ricky John  Helm et al → Antelope Creek Trucking; 2012-04-04 to 2015-09-10; source msha-controller-operator-history
- **controller_controls_operator:** Randy  Byrum et al → Antelope Creek Trucking; 2012-04-04 to 2015-09-10; source msha-controller-operator-history
- **operator_operates_mine:** Antelope Creek Trucking, Inc. → Pit 1; 2015-09-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Susan  Byrum et al → Pit 1; 2015-09-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Susan  Byrum et al → Antelope Creek Trucking, Inc.; 2015-09-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Randy  Byrum et al → Antelope Creek Trucking, Inc.; 2015-09-11 to current/open; source msha-controller-operator-history