# Relationship history for MSHA mine 4503173

Current hierarchy: **Nick L.  Seegert Jr. → Seegert Crushing Inc → Rock Plant**

- 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:** Seegert Inc → Rock Plant; 1988-08-01 to 2007-05-29; source msha-controller-operator-history
- **controller_controls_mine:** Nicholas L  Seegert Sr → Rock Plant; 1988-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nicholas L  Seegert Sr → Seegert Inc; 1988-08-01 to 2007-05-29; source msha-controller-operator-history
- **operator_operates_mine:** Seegert Crushing Inc → Rock Plant; 2007-05-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Nick L.  Seegert Jr. → Rock Plant; 2007-05-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nick L.  Seegert Jr. → Seegert Crushing Inc; 2007-05-30 to current/open; source msha-controller-operator-history