# Relationship history for MSHA mine 3606122

Current hierarchy: **Fetterolf Group Inc → Fetterolf Mining Sales Company → Mountain Mine #1**

- 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:** Mountain Mining Company Inc → Mountain Mine #1; 1976-07-01 to 1978-10-31; source msha-controller-operator-history
- **controller_controls_mine:** John  Toth et al → Mountain Mine #1; 1976-07-01 to 1978-10-31; source msha-controller-operator-history
- **controller_controls_operator:** John  Toth et al → Mountain Mining Company Inc; 1976-07-01 to 1978-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Fetterolf Mining Sales Company → Mountain Mine #1; 1978-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fetterolf Group Inc → Mountain Mine #1; 1978-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fetterolf Group Inc → Fetterolf Mining Sales Company; 1978-11-01 to current/open; source msha-controller-operator-history