# Relationship history for MSHA mine 4604196

Current hierarchy: **Marenko Clifford → Hi Mar 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:** D & R Coal Company → No 1 Mine; 1974-03-08 to 1976-02-08; source msha-controller-operator-history
- **controller_controls_mine:** Smith Don & Roy Lester → No 1 Mine; 1974-03-08 to 1976-02-08; source msha-controller-operator-history
- **controller_controls_operator:** Smith Don & Roy Lester → D & R Coal Company; 1974-03-08 to 1976-02-08; source msha-controller-operator-history
- **operator_operates_mine:** K & S Coal Company Inc → No 1 Mine; 1976-02-09 to 1977-06-26; source msha-controller-operator-history
- **controller_controls_mine:** Smith Frank B & William C Kramer → No 1 Mine; 1976-02-09 to 1977-06-26; source msha-controller-operator-history
- **controller_controls_operator:** Smith Frank B & William C Kramer → K & S Coal Company Inc; 1976-02-09 to 1977-06-26; source msha-controller-operator-history
- **operator_operates_mine:** Hi Mar Coal Company Inc → No 1 Mine; 1977-06-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Marenko Clifford → No 1 Mine; 1977-06-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marenko Clifford → Hi Mar Coal Company Inc; 1977-06-27 to current/open; source msha-controller-operator-history