# Relationship history for MSHA mine 1201757

Current hierarchy: **Ian C  King → Hoosier Calcium Corp → HOOSIER CALCIUM CORP.**

- 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

- **operator_operates_mine:** Indiana Cal-Pro Inc → HOOSIER CALCIUM CORP.; 1979-12-01 to 1989-06-23; source msha-controller-operator-history
- **controller_controls_mine:** Cowan Stone Company → HOOSIER CALCIUM CORP.; 1979-12-01 to 1989-06-23; source msha-controller-operator-history
- **controller_controls_operator:** Cowan Stone Company → Indiana Cal-Pro Inc; 1979-12-01 to 1989-06-23; source msha-controller-operator-history
- **operator_operates_mine:** Hoosier Calcium Corp → HOOSIER CALCIUM CORP.; 1989-06-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ian C  King → HOOSIER CALCIUM CORP.; 1989-06-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ian C  King → Hoosier Calcium Corp; 1989-06-24 to current/open; source msha-controller-operator-history