# Relationship history for MSHA mine 4604352

Current hierarchy: **Rodgers Frank → Sycamore Industries Inc → Mc Worter Strip Mine**

- 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:** Rodgers Frank → Mc Worter Strip Mine; 1974-09-26 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sycamore Industries Inc → Mc Worter Strip Mine; 1974-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rodgers Frank → Sycamore Industries Inc; 1974-10-01 to current/open; source msha-controller-operator-history