# Relationship history for MSHA mine 4603278

Current hierarchy: **Frye Roger → Frye-Ko Tipple Inc → Frye-Ko No 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

- **operator_operates_mine:** Eran Coal Company → Frye-Ko No 1; 1950-01-01 to 1984-01-18; source msha-controller-operator-history
- **controller_controls_mine:** Summerfield A W → Frye-Ko No 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Summerfield A W → Eran Coal Company; 1950-01-01 to 1984-01-18; source msha-controller-operator-history
- **operator_operates_mine:** Frye-Ko Tipple Inc → Frye-Ko No 1; 1984-01-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Frye Roger → Frye-Ko No 1; 1984-01-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Frye Roger → Frye-Ko Tipple Inc; 1984-01-19 to current/open; source msha-controller-operator-history