# Relationship history for MSHA mine 2501081

Current hierarchy: **Jeffrey D  Vakoc; Daniel A  Vakoc → Vakoc Excavating LLC → Portable Plant #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:** Vakoc Construction → Portable Plant #1; 1987-05-01 to 2015-03-11; source msha-controller-operator-history
- **controller_controls_mine:** Daniel A  Vakoc → Portable Plant #1; 1987-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel A  Vakoc → Vakoc Construction; 1987-05-01 to 2015-03-11; source msha-controller-operator-history
- **operator_operates_mine:** Vakoc Excavating LLC → Portable Plant #1; 2015-03-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jeffrey D  Vakoc et al → Portable Plant #1; 2015-03-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeffrey D  Vakoc et al → Vakoc Excavating LLC; 2015-03-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel A  Vakoc et al → Vakoc Excavating LLC; 2015-03-12 to current/open; source msha-controller-operator-history