# Relationship history for MSHA mine 0404946

Current hierarchy: **Hofer Ernest J → Hofer & Sons → Am Sod**

- 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:** Hofer & Sons → Am Sod; 1988-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hofer Ernest J → Am Sod; 1988-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hofer Ernest J → Hofer & Sons; 1988-05-01 to current/open; source msha-controller-operator-history