# Relationship history for MSHA mine 1103234

Current hierarchy: **Gary  Bollmeier → Cheyenne Enterprises Inc. → Frontier 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:** Gary  Bollmeier → Frontier Mine; 2010-08-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cheyenne Enterprises Inc. → Frontier Mine; 2010-11-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary  Bollmeier → Cheyenne Enterprises Inc.; 2010-11-12 to current/open; source msha-controller-operator-history