# Relationship history for MSHA mine 3607275

Current hierarchy: **Gurzenda Joseph → Parschantel Energy Inc → Tuscarora 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:** Folmer A Gong Ltd → Tuscarora Mine; 1982-03-01 to 1988-05-03; source msha-controller-operator-history
- **controller_controls_mine:** Kovalchick Peter → Tuscarora Mine; 1982-03-01 to 1988-05-03; source msha-controller-operator-history
- **controller_controls_operator:** Kovalchick Peter → Folmer A Gong Ltd; 1982-03-01 to 1988-05-03; source msha-controller-operator-history
- **operator_operates_mine:** Parschantel Energy Inc → Tuscarora Mine; 1988-05-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gurzenda Joseph → Tuscarora Mine; 1988-05-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gurzenda Joseph → Parschantel Energy Inc; 1988-05-04 to current/open; source msha-controller-operator-history