# Relationship history for MSHA mine 4300584

Current hierarchy: **Steele T  Griswold → S.T. Griswold & Co, Inc. → S.T. Griswold Pit**

- 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:** Steele T  Griswold → S.T. Griswold Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** S.T. Griswold & Co, Inc. → S.T. Griswold Pit; 2002-09-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steele T  Griswold → S.T. Griswold & Co, Inc.; 2002-09-24 to current/open; source msha-controller-operator-history