# Relationship history for MSHA mine 2700465

Current hierarchy: **Clark S  Bogie → CHIEF CRUSHING & EXCAVATION INC → Nick's Aggregates**

- 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:** Clark S  Bogie → Nick's Aggregates; 2008-07-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** CHIEF CRUSHING & EXCAVATION INC → Nick's Aggregates; 2012-11-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Clark S  Bogie → CHIEF CRUSHING & EXCAVATION INC; 2012-11-06 to current/open; source msha-controller-operator-history