# Relationship history for MSHA mine 1508918

Current hierarchy: **Holsapple W G Jr → H & G Construction Company Inc → H & G No 1 Strip**

- 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:** H & G Construction Company Inc → H & G No 1 Strip; 1975-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Holsapple W G Jr → H & G No 1 Strip; 1975-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holsapple W G Jr → H & G Construction Company Inc; 1975-08-01 to current/open; source msha-controller-operator-history