# Relationship history for MSHA mine 4609566

Current hierarchy: **Kenneth C  Lambert → Pivotal Coal Inc → #1 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:** Pivotal Coal Inc → #1 Mine; 2019-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kenneth C  Lambert → #1 Mine; 2019-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth C  Lambert → Pivotal Coal Inc; 2019-03-27 to current/open; source msha-controller-operator-history