# Relationship history for MSHA mine 4403855

Current hierarchy: **Berwind Corporation → Kyber Coal Company Inc → No 1 Tipple**

- 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:** James W  Potter et al → No 1 Tipple; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Potter Mining Company Inc → No 1 Tipple; 1974-01-01 to 1985-08-06; source msha-controller-operator-history
- **controller_controls_operator:** James W  Potter et al → Potter Mining Company Inc; 1974-01-01 to 1985-08-06; source msha-controller-operator-history
- **operator_operates_mine:** Kyber Coal Company Inc → No 1 Tipple; 1985-08-07 to 1990-04-02; source msha-controller-operator-history
- **controller_controls_mine:** Berwind Corporation → No 1 Tipple; 1985-08-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Berwind Corporation → Kyber Coal Company Inc; 1985-08-07 to 1990-04-02; source msha-controller-operator-history
- **controller_controls_mine:** Thomas A  Potter et al → No 1 Tipple; 1987-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sunny Ridge Mining Company Inc → No 1 Tipple; 1990-04-03 to 1991-06-23; source msha-controller-operator-history
- **controller_controls_operator:** Thomas A  Potter et al → Sunny Ridge Mining Company Inc; 1990-04-03 to 1991-06-23; source msha-controller-operator-history
- **controller_controls_operator:** John M  Potter et al → Sunny Ridge Mining Company Inc; 1990-04-03 to 1991-06-23; source msha-controller-operator-history
- **operator_operates_mine:** Kyber Coal Company Inc → No 1 Tipple; 1991-06-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Berwind Corporation → Kyber Coal Company Inc; 1991-06-24 to current/open; source msha-controller-operator-history