# Relationship history for MSHA mine 2000552

Current hierarchy: **SCIH Salt Holdings, Inc → Detroit Salt Co LLC → DETROIT SALT MINE**

- 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:** Akzo Salt Inc → DETROIT SALT MINE; 1950-01-01 to 1997-12-21; source msha-controller-operator-history
- **controller_controls_mine:** Akzo Nobel N V → DETROIT SALT MINE; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Akzo Nobel N V → Akzo Salt Inc; 1950-01-01 to 1997-12-21; source msha-controller-operator-history
- **operator_operates_mine:** Detroit Salt Co LLC → DETROIT SALT MINE; 1997-12-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Emanuel Z  Manos  et al → DETROIT SALT MINE; 1997-12-22 to 2010-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Emanuel Z  Manos  et al → Detroit Salt Co LLC; 1997-12-22 to 2010-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Janette  Ferrantino  et al → Detroit Salt Co LLC; 1997-12-22 to 2010-10-31; source msha-controller-operator-history
- **controller_controls_mine:** The Kissner Group → DETROIT SALT MINE; 2010-11-01 to 2021-04-29; source msha-controller-operator-history
- **controller_controls_operator:** The Kissner Group → Detroit Salt Co LLC; 2010-11-01 to 2021-04-29; source msha-controller-operator-history
- **controller_controls_mine:** SCIH Salt Holdings, Inc → DETROIT SALT MINE; 2021-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** SCIH Salt Holdings, Inc → Detroit Salt Co LLC; 2021-04-30 to current/open; source msha-controller-operator-history