# Relationship history for MSHA mine 4103703

Current hierarchy: **Jan  Clem → Cass County Crushing Company Inc → PORTABLE CRUSHER**

- 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:** Cass County Crushing Company Inc → PORTABLE CRUSHER; 1991-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jan  Clem → PORTABLE CRUSHER; 1991-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jan  Clem → Cass County Crushing Company Inc; 1991-12-01 to current/open; source msha-controller-operator-history