# Relationship history for MSHA mine 1401381

Current hierarchy: **Kenneth L  Gladden → Gladden Excavating Inc → J & S Kerr-Cimarron Ready Mix**

- 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

- **controller_controls_mine:** Kenneth L  Gladden → J & S Kerr-Cimarron Ready Mix; 1980-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Gladden Excavating Inc → J & S Kerr-Cimarron Ready Mix; 1980-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth L  Gladden → Gladden Excavating Inc; 1980-10-01 to current/open; source msha-controller-operator-history