# Relationship history for MSHA mine 4607171

Current hierarchy: **Endicott Shelby R → Ro-Ann Leasing Inc → Ro-Ann 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Kimax Coal Company Inc → Ro-Ann No 1 Mine; 1986-07-01 to 1986-11-16; source msha-controller-operator-history
- **controller_controls_mine:** Stone Maxine → Ro-Ann No 1 Mine; 1986-07-01 to 1986-11-16; source msha-controller-operator-history
- **controller_controls_operator:** Stone Maxine → Kimax Coal Company Inc; 1986-07-01 to 1986-11-16; source msha-controller-operator-history
- **operator_operates_mine:** Premier Energy Inc → Ro-Ann No 1 Mine; 1986-11-17 to 1987-09-24; source msha-controller-operator-history
- **controller_controls_mine:** Webb Michael J → Ro-Ann No 1 Mine; 1986-11-17 to 1987-10-14; source msha-controller-operator-history
- **controller_controls_operator:** Webb Michael J → Premier Energy Inc; 1986-11-17 to 1987-09-24; source msha-controller-operator-history
- **controller_controls_mine:** Ellis Charles M → Ro-Ann No 1 Mine; 1987-02-17 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tri Star Construction Inc → Ro-Ann No 1 Mine; 1987-09-25 to 1990-02-11; source msha-controller-operator-history
- **controller_controls_mine:** Mamone Tony → Ro-Ann No 1 Mine; 1987-09-25 to 1990-02-11; source msha-controller-operator-history
- **controller_controls_operator:** Mamone Tony → Tri Star Construction Inc; 1987-09-25 to 1990-02-11; source msha-controller-operator-history
- **operator_operates_mine:** Big Sue Coal Company Inc → Ro-Ann No 1 Mine; 1990-02-12 to 1991-04-14; source msha-controller-operator-history
- **controller_controls_operator:** Ellis Charles M → Big Sue Coal Company Inc; 1990-02-12 to 1991-04-14; source msha-controller-operator-history
- **operator_operates_mine:** Ro-Ann Leasing Inc → Ro-Ann No 1 Mine; 1991-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Endicott Shelby R → Ro-Ann No 1 Mine; 1991-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Endicott Shelby R → Ro-Ann Leasing Inc; 1991-04-15 to current/open; source msha-controller-operator-history