# Relationship history for MSHA mine 3604861

Current hierarchy: **Marlowe Frederick Sr → Marlowe Mining Co → Penfield No 1 Tipple**

- 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

- **controller_controls_mine:** Marlowe Frederick Sr → Penfield No 1 Tipple; 1973-12-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Marlowe Mining Co → Penfield No 1 Tipple; 1974-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marlowe Frederick Sr → Marlowe Mining Co; 1974-01-01 to current/open; source msha-controller-operator-history