# Relationship history for MSHA mine 3503947

Current hierarchy: **Eric D  Kuenzi; John L  Kuenzi; Kerry D  Kuenzi → K & E Excavating, Inc. → Portable 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Kerry D  Kuenzi et al → Portable 1; 2018-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** K & E Excavating, Inc. → Portable 1; 2023-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kerry D  Kuenzi et al → K & E Excavating, Inc.; 2023-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John L  Kuenzi et al → K & E Excavating, Inc.; 2023-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eric D  Kuenzi et al → K & E Excavating, Inc.; 2023-04-20 to current/open; source msha-controller-operator-history