# Relationship history for MSHA mine 3002513

Current hierarchy: **Daniel R  Hawbaker → Glenn O Hawbaker Inc → Machias Aggregate Plant #47**

- 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

- **operator_operates_mine:** Boser Landscaping Corp → Machias Aggregate Plant #47; 1980-05-01 to 1990-05-29; source msha-controller-operator-history
- **controller_controls_mine:** Ted  Boser → Machias Aggregate Plant #47; 1980-05-01 to 1990-05-29; source msha-controller-operator-history
- **controller_controls_operator:** Ted  Boser → Boser Landscaping Corp; 1980-05-01 to 1990-05-29; source msha-controller-operator-history
- **controller_controls_mine:** Daniel R  Hawbaker  et al → Machias Aggregate Plant #47; 1983-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ungermann Excavating, Inc. → Machias Aggregate Plant #47; 1990-05-30 to 2025-01-19; source msha-controller-operator-history
- **controller_controls_mine:** Norman G  Ungermann Jr → Machias Aggregate Plant #47; 1990-05-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Norman G  Ungermann Jr → Ungermann Excavating, Inc.; 1990-05-30 to 2025-01-19; source msha-controller-operator-history
- **operator_operates_mine:** Glenn O Hawbaker Inc. → Machias Aggregate Plant #47; 2025-01-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel R  Hawbaker  et al → Glenn O Hawbaker Inc.; 2025-01-20 to current/open; source msha-controller-operator-history