# Relationship history for MSHA mine 1400753

Current hierarchy: **Jensen Peter A Jr → St Francis Sand & Redi-Mix → St Francis Sand & Redi-Mix Dredge**

- 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:** Goodland Redi Mix Inc → St Francis Sand & Redi-Mix Dredge; 1950-01-01 to 1988-05-11; source msha-controller-operator-history
- **controller_controls_mine:** Baldwin Donald W → St Francis Sand & Redi-Mix Dredge; 1950-01-01 to 1988-05-11; source msha-controller-operator-history
- **controller_controls_operator:** Baldwin Donald W → Goodland Redi Mix Inc; 1950-01-01 to 1988-05-11; source msha-controller-operator-history
- **operator_operates_mine:** St Francis Sand & Redi-Mix → St Francis Sand & Redi-Mix Dredge; 1988-05-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jensen Peter A Jr → St Francis Sand & Redi-Mix Dredge; 1988-05-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jensen Peter A Jr → St Francis Sand & Redi-Mix; 1988-05-12 to current/open; source msha-controller-operator-history