# Relationship history for MSHA mine 2103045

Current hierarchy: **Horkey Thomas J & James R → Horkey Road Construction → PORTABLE-#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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Horkey Road Construction → PORTABLE-#1; 1991-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Horkey Thomas J & James R → PORTABLE-#1; 1991-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Horkey Thomas J & James R → Horkey Road Construction; 1991-10-01 to current/open; source msha-controller-operator-history