# Relationship history for MSHA mine 2103495

Current hierarchy: **John  Zavoral; Benjamin Robert  Horken; Daniel John  Zavoral; Joseph Rob → R.J. Zavoral Paving, Inc. → Vergas Pit**

- 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:** Curtis W  Olson → Vergas Pit; 2002-05-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Olson Gravel Inc → Vergas Pit; 2005-05-17 to 2025-10-06; source msha-controller-operator-history
- **controller_controls_operator:** Curtis W  Olson → Olson Gravel Inc; 2005-05-17 to 2025-10-06; source msha-controller-operator-history
- **controller_controls_mine:** Robert M Zavoral et al → Vergas Pit; 2017-05-30 to 2025-10-06; source msha-controller-operator-history
- **operator_operates_mine:** R.J. Zavoral Paving, Inc. → Vergas Pit; 2025-10-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert M Zavoral et al → R.J. Zavoral Paving, Inc.; 2025-10-07 to 2025-10-06; source msha-controller-operator-history
- **controller_controls_operator:** Peter M Zavoral et al → R.J. Zavoral Paving, Inc.; 2025-10-07 to 2025-10-06; source msha-controller-operator-history
- **controller_controls_mine:** Daniel John  Zavoral et al → Vergas Pit; 2025-10-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel John  Zavoral et al → R.J. Zavoral Paving, Inc.; 2025-10-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joseph Robert  Zavoral et al → R.J. Zavoral Paving, Inc.; 2025-10-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Benjamin Robert  Horken et al → R.J. Zavoral Paving, Inc.; 2025-10-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Zavoral et al → R.J. Zavoral Paving, Inc.; 2025-10-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael Shane  Zavoral et al → R.J. Zavoral Paving, Inc.; 2025-10-07 to current/open; source msha-controller-operator-history