# Relationship history for MSHA mine 2003601

Current hierarchy: **Jason  Livingston; Cory  Pangborn → Bichler Concrete and Gravel → Kleeman MR130Zi**

- 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

- **controller_controls_mine:** Jason  Livingston et al → Kleeman MR130Zi; 2018-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bichler Concrete and Gravel → Kleeman MR130Zi; 2020-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jason  Livingston et al → Bichler Concrete and Gravel; 2020-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cory  Pangborn et al → Bichler Concrete and Gravel; 2020-06-30 to current/open; source msha-controller-operator-history