# Relationship history for MSHA mine 3609978

Current hierarchy: **David M  DeCristo → DeCristo Inc. → DeCristo/Armenia Mountain Quarry**

- 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:** Daniel R  Hawbaker  et al → DeCristo/Armenia Mountain Quarry; 1983-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David M  DeCristo → DeCristo/Armenia Mountain Quarry; 2010-05-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Glenn O. Hawbaker, Inc. → DeCristo/Armenia Mountain Quarry; 2011-12-20 to 2017-05-15; source msha-controller-operator-history
- **controller_controls_operator:** Daniel R  Hawbaker  et al → Glenn O. Hawbaker, Inc.; 2011-12-20 to 2017-05-15; source msha-controller-operator-history
- **operator_operates_mine:** DeCristo Inc. → DeCristo/Armenia Mountain Quarry; 2017-05-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David M  DeCristo → DeCristo Inc.; 2017-05-16 to current/open; source msha-controller-operator-history