# Relationship history for MSHA mine 3604779

Current hierarchy: **Bow Valley Industries Ltd → Francis Fuel Inc → Francis 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

- **controller_controls_mine:** Raymond  Chess → Francis Mine; 1950-01-01 to 1975-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Dunkard Mining Company → Francis Mine; 1973-01-01 to 1973-09-15; source msha-controller-operator-history
- **controller_controls_operator:** Raymond  Chess → Dunkard Mining Company; 1973-01-01 to 1973-09-15; source msha-controller-operator-history
- **operator_operates_mine:** Francis Fuel Company Inc → Francis Mine; 1973-09-16 to 1975-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Cyphert Patrick F → Francis Mine; 1973-09-16 to 1975-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Cyphert Patrick F → Francis Fuel Company Inc; 1973-09-16 to 1975-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Francis Fuel Inc → Francis Mine; 1976-01-01 to 1984-01-26; source msha-controller-operator-history
- **controller_controls_mine:** James E  Bergesen → Francis Mine; 1976-01-01 to 1984-01-26; source msha-controller-operator-history
- **controller_controls_operator:** James E  Bergesen → Francis Fuel Inc; 1976-01-01 to 1984-01-26; source msha-controller-operator-history
- **operator_operates_mine:** Francis Fuel Inc → Francis Mine; 1984-01-27 to 1986-02-26; source msha-controller-operator-history
- **controller_controls_mine:** Prodeco Investments Inc → Francis Mine; 1984-01-27 to 1986-02-26; source msha-controller-operator-history
- **controller_controls_operator:** Prodeco Investments Inc → Francis Fuel Inc; 1984-01-27 to 1986-02-26; source msha-controller-operator-history
- **operator_operates_mine:** Francis Fuel Inc → Francis Mine; 1986-02-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bow Valley Industries Ltd → Francis Mine; 1986-02-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bow Valley Industries Ltd → Francis Fuel Inc; 1986-02-27 to current/open; source msha-controller-operator-history