# Relationship history for MSHA mine 3304178

Current hierarchy: **Shelly Company → Shelly Materials Inc → SHELLY MATERIALS INC. WEST MILTO**

- 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:** Shelly Company → SHELLY MATERIALS INC. WEST MILTO; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Stillwater Sand & Gravel Inc → SHELLY MATERIALS INC. WEST MILTO; 1989-09-01 to 1995-10-12; source msha-controller-operator-history
- **controller_controls_mine:** Bohse Ed → SHELLY MATERIALS INC. WEST MILTO; 1989-09-01 to 1995-10-12; source msha-controller-operator-history
- **controller_controls_operator:** Bohse Ed → Stillwater Sand & Gravel Inc; 1989-09-01 to 1995-10-12; source msha-controller-operator-history
- **operator_operates_mine:** Shelly Materials Inc → SHELLY MATERIALS INC. WEST MILTO; 1995-10-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shelly Company → Shelly Materials Inc; 1995-10-13 to current/open; source msha-controller-operator-history