# Relationship history for MSHA mine 2401723

Current hierarchy: **Eckart Oliver → Eckart Construction → Eckart Portable Crusher**

- 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:** Eckart Construction → Eckart Portable Crusher; 1983-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Eckart Oliver → Eckart Portable Crusher; 1983-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eckart Oliver → Eckart Construction; 1983-06-01 to current/open; source msha-controller-operator-history