# Relationship history for MSHA mine 4702688

Current hierarchy: **Joseph  Murphy → MCC, Inc. → Crivitz Ready Mix Company**

- 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

- **controller_controls_mine:** Joseph  Murphy → Crivitz Ready Mix Company; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Schroeder Sand & Gravel → Crivitz Ready Mix Company; 1980-06-01 to 1986-10-15; source msha-controller-operator-history
- **controller_controls_mine:** Bill  Schroeder et al → Crivitz Ready Mix Company; 1980-06-01 to 1986-10-15; source msha-controller-operator-history
- **controller_controls_operator:** Bill  Schroeder et al → Schroeder Sand & Gravel; 1980-06-01 to 1986-10-15; source msha-controller-operator-history
- **operator_operates_mine:** Crivitz Ready Mix Inc → Crivitz Ready Mix Company; 1986-10-16 to 2004-04-14; source msha-controller-operator-history
- **controller_controls_mine:** Eugene  Golla → Crivitz Ready Mix Company; 1986-10-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eugene  Golla → Crivitz Ready Mix Inc; 1986-10-16 to 2004-04-14; source msha-controller-operator-history
- **operator_operates_mine:** MCC, Inc → Crivitz Ready Mix Company; 2004-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joseph  Murphy → MCC, Inc; 2004-04-15 to current/open; source msha-controller-operator-history