# Relationship history for MSHA mine 1401844

Current hierarchy: **Cody Joseph Michaelis; Tammy Marie Michaelis → Frontier Native Stone LLC → FNS1**

- 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:** Tammy Marie Michaelis et al → FNS1; 2023-10-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Frontier Native Stone LLC → FNS1; 2024-03-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tammy Marie Michaelis et al → Frontier Native Stone LLC; 2024-03-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cody Joseph Michaelis et al → Frontier Native Stone LLC; 2024-03-26 to current/open; source msha-controller-operator-history