# Relationship history for MSHA mine 0500978

Current hierarchy: **Larry W  Corn → Corn Mobil Mix Company → Corn Mobil 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

- **operator_operates_mine:** Fruita Ready Mix Company → Corn Mobil Mix Company; 1950-01-01 to 1979-09-03; source msha-controller-operator-history
- **controller_controls_mine:** Greb Arthur R → Corn Mobil Mix Company; 1950-01-01 to 1979-09-03; source msha-controller-operator-history
- **controller_controls_operator:** Greb Arthur R → Fruita Ready Mix Company; 1950-01-01 to 1979-09-03; source msha-controller-operator-history
- **operator_operates_mine:** Corn Mobil Mix Company → Corn Mobil Mix Company; 1979-09-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Larry W  Corn → Corn Mobil Mix Company; 1979-09-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry W  Corn → Corn Mobil Mix Company; 1979-09-04 to current/open; source msha-controller-operator-history