# Relationship history for MSHA mine 0400217

Current hierarchy: **Ssangyong Corp → Partin Limestone Products Inc → PARTIN LIMESTONE PRODUCTS**

- 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:** Partin Limestone Products Inc → PARTIN LIMESTONE PRODUCTS; 1950-01-01 to 1989-10-19; source msha-controller-operator-history
- **controller_controls_mine:** Partin Carl → PARTIN LIMESTONE PRODUCTS; 1950-01-01 to 1989-10-19; source msha-controller-operator-history
- **controller_controls_operator:** Partin Carl → Partin Limestone Products Inc; 1950-01-01 to 1989-10-19; source msha-controller-operator-history
- **operator_operates_mine:** Partin Limestone Products Inc → PARTIN LIMESTONE PRODUCTS; 1989-10-20 to 1995-02-27; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → PARTIN LIMESTONE PRODUCTS; 1989-10-20 to 1995-02-27; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Partin Limestone Products Inc; 1989-10-20 to 1995-02-27; source msha-controller-operator-history
- **operator_operates_mine:** Partin Limestone Products Inc → PARTIN LIMESTONE PRODUCTS; 1995-02-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ssangyong Corp → PARTIN LIMESTONE PRODUCTS; 1995-02-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ssangyong Corp → Partin Limestone Products Inc; 1995-02-28 to current/open; source msha-controller-operator-history