# Relationship history for MSHA mine 1515048

Current hierarchy: **Mann Franklin & Haskell Addington → Fountain Blue Coal Company Inc → No 1 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

- **operator_operates_mine:** Teamco Mining Incorpoated → No 1 Mine; 1985-01-01 to 1985-11-19; source msha-controller-operator-history
- **controller_controls_mine:** Isenhoff Ike → No 1 Mine; 1985-01-01 to 1985-11-19; source msha-controller-operator-history
- **controller_controls_operator:** Isenhoff Ike → Teamco Mining Incorpoated; 1985-01-01 to 1985-11-19; source msha-controller-operator-history
- **operator_operates_mine:** Fountain Blue Coal Company Inc → No 1 Mine; 1985-11-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mann Franklin & Haskell Addington → No 1 Mine; 1985-11-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mann Franklin & Haskell Addington → Fountain Blue Coal Company Inc; 1985-11-20 to current/open; source msha-controller-operator-history