# Relationship history for MSHA mine 4800026

Current hierarchy: **Imerys S A → Imerys Marble Inc → Imerys Marble Incorporated**

- 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:** Basins Inc → Imerys Marble Incorporated; 1950-01-01 to 1986-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Basins Inc → Imerys Marble Incorporated; 1950-01-01 to 1986-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Basins Inc → Basins Inc; 1950-01-01 to 1986-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Jim Walter Corp → Imerys Marble Incorporated; 1986-01-30 to 1989-05-30; source msha-controller-operator-history
- **operator_operates_mine:** Basins Inc → Imerys Marble Incorporated; 1986-06-01 to 1989-05-30; source msha-controller-operator-history
- **controller_controls_operator:** Jim Walter Corp → Basins Inc; 1986-06-01 to 1989-05-30; source msha-controller-operator-history
- **operator_operates_mine:** Imerys Marble Inc → Imerys Marble Incorporated; 1989-05-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Imerys S A → Imerys Marble Incorporated; 1989-05-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Imerys S A → Imerys Marble Inc; 1989-05-31 to current/open; source msha-controller-operator-history