# Relationship history for MSHA mine 0404122

Current hierarchy: **Chris E  Babcock; Wallace K  Love → Cal-Ci-Co Rock Company Inc → Trona Mill**

- 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:** Cal-Ci-Co Rock Company Inc → Trona Mill; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wallace K  Love  et al → Trona Mill; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wallace K  Love  et al → Cal-Ci-Co Rock Company Inc; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chris E  Babcock  et al → Cal-Ci-Co Rock Company Inc; 1950-01-01 to current/open; source msha-controller-operator-history