# Relationship history for MSHA mine 4701788

Current hierarchy: **Theo C  Froemming; Jack A  Froemming → Hillview Sand & Gravel Corp → Valley Pit**

- 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:** Hillview Sand & Gravel Corp → Valley Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Theo C  Froemming  et al → Valley Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Theo C  Froemming  et al → Hillview Sand & Gravel Corp; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jack A  Froemming  et al → Hillview Sand & Gravel Corp; 1950-01-01 to current/open; source msha-controller-operator-history