# Relationship history for MSHA mine 3610074

Current hierarchy: **Richard  Frantz → Frantz Brothers Resources LLC → Frantz Brothers Strips**

- 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:** Frantz Brothers Resources LLC → Frantz Brothers Strips; 2013-07-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Richard  Frantz et al → Frantz Brothers Strips; 2013-07-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard  Frantz et al → Frantz Brothers Resources LLC; 2013-07-15 to current/open; source msha-controller-operator-history