# Relationship history for MSHA mine 3303652

Current hierarchy: **Holmes Limestone → Son Enterprises Inc → Elder Surface**

- 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

- **controller_controls_mine:** Holmes Limestone → Elder Surface; 1977-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Son Enterprises Inc → Elder Surface; 1977-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holmes Limestone → Son Enterprises Inc; 1977-10-01 to current/open; source msha-controller-operator-history