# Relationship history for MSHA mine 1518798

Current hierarchy: **Chris S  Howard → Howard Brothers Excavating, Inc. → No. 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Howard Brothers Excavating, Inc. → No. 1; 2004-09-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Chris S  Howard et al → No. 1; 2004-09-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chris S  Howard et al → Howard Brothers Excavating, Inc.; 2004-09-08 to current/open; source msha-controller-operator-history