# Relationship history for MSHA mine 1103024

Current hierarchy: **Daniele R  Sproule → Sproule Construction Inc → Portable No. 2**

- 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

- **controller_controls_mine:** Daniele R  Sproule et al → Portable No. 2; 1994-08-31 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sproule Construction Inc → Portable No. 2; 1998-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniele R  Sproule et al → Sproule Construction Inc; 1998-06-01 to current/open; source msha-controller-operator-history