# Relationship history for MSHA mine 1900570

Current hierarchy: **Julie  Callahan → Jjc Materials Inc → JJC MATERIALS INC.**

- 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:** J J Raczka Inc → JJC MATERIALS INC.; 1950-01-01 to 1996-05-30; source msha-controller-operator-history
- **controller_controls_mine:** Irene  Raczka → JJC MATERIALS INC.; 1950-01-01 to 1996-05-30; source msha-controller-operator-history
- **controller_controls_operator:** Irene  Raczka → J J Raczka Inc; 1950-01-01 to 1996-05-30; source msha-controller-operator-history
- **operator_operates_mine:** Jjc Materials Inc → JJC MATERIALS INC.; 1996-05-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Julie  Callahan → JJC MATERIALS INC.; 1996-05-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Julie  Callahan → Jjc Materials Inc; 1996-05-31 to current/open; source msha-controller-operator-history