# Relationship history for MSHA mine 4405431

Current hierarchy: **James A  Sigmon → Hobcaw Coal Incorporated → Hobcaw #1**

- 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

- **controller_controls_mine:** Baker Ralph → Hobcaw #1; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mason Coal Company Inc → Hobcaw #1; 1980-05-01 to 1984-03-09; source msha-controller-operator-history
- **controller_controls_operator:** Baker Ralph → Mason Coal Company Inc; 1980-05-01 to 1984-03-09; source msha-controller-operator-history
- **controller_controls_mine:** Baker Ralph → Hobcaw #1; 1982-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kol-Heat Inc → Hobcaw #1; 1984-03-10 to 1986-02-16; source msha-controller-operator-history
- **controller_controls_mine:** Wallen Glenn A → Hobcaw #1; 1984-03-10 to 1986-02-16; source msha-controller-operator-history
- **controller_controls_operator:** Wallen Glenn A → Kol-Heat Inc; 1984-03-10 to 1986-02-16; source msha-controller-operator-history
- **operator_operates_mine:** Little Mountain Coal Inc → Hobcaw #1; 1986-02-17 to 1986-10-05; source msha-controller-operator-history
- **controller_controls_operator:** Baker Ralph → Little Mountain Coal Inc; 1986-02-17 to 1986-10-05; source msha-controller-operator-history
- **operator_operates_mine:** M Coal Corp → Hobcaw #1; 1986-10-06 to 1986-12-28; source msha-controller-operator-history
- **controller_controls_mine:** Hughes Michael R → Hobcaw #1; 1986-10-06 to 1986-12-28; source msha-controller-operator-history
- **controller_controls_operator:** Hughes Michael R → M Coal Corp; 1986-10-06 to 1986-12-28; source msha-controller-operator-history
- **operator_operates_mine:** Little Mountain Coal Inc → Hobcaw #1; 1986-12-29 to 1990-04-16; source msha-controller-operator-history
- **controller_controls_operator:** Baker Ralph → Little Mountain Coal Inc; 1986-12-29 to 1990-04-16; source msha-controller-operator-history
- **operator_operates_mine:** Hobcaw Coal Incorporated → Hobcaw #1; 1990-04-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James A  Sigmon → Hobcaw #1; 1990-04-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James A  Sigmon → Hobcaw Coal Incorporated; 1990-04-17 to current/open; source msha-controller-operator-history