# Relationship history for MSHA mine 2103078

Current hierarchy: **Kerry  Abramson → KGM Contractors Inc. → KGM Contractors Inc.**

- 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:** KGM Contractors Inc. → KGM Contractors Inc.; 1994-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Karla  Abramson et al → KGM Contractors Inc.; 1994-05-01 to 2025-06-27; source msha-controller-operator-history
- **controller_controls_operator:** Karla  Abramson et al → KGM Contractors Inc.; 1994-05-01 to 2025-06-27; source msha-controller-operator-history
- **controller_controls_mine:** Kerry  Abramson → KGM Contractors Inc.; 2025-06-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kerry  Abramson → KGM Contractors Inc.; 2025-06-28 to current/open; source msha-controller-operator-history