# Relationship history for MSHA mine 1513675

Current hierarchy: **Holsapple W G Jr → H & G Construction Company Inc → H & G Mine B 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

- **controller_controls_mine:** Holsapple W G Jr → H & G Mine B 1; 1975-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** H & G Construction Company Inc → H & G Mine B 1; 1982-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holsapple W G Jr → H & G Construction Company Inc; 1982-07-01 to current/open; source msha-controller-operator-history