# Relationship history for MSHA mine 4702525

Current hierarchy: **Dennis J  Thier → Glendenning Limestone & Redi-Mix Co Inc → Portable Unit #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:** Glendenning Limestone & Redi-Mix Co Inc → Portable Unit #1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Larry  Glendenning → Portable Unit #1; 1950-01-01 to 2009-05-05; source msha-controller-operator-history
- **controller_controls_operator:** Larry  Glendenning → Glendenning Limestone & Redi-Mix Co Inc; 1950-01-01 to 2009-05-05; source msha-controller-operator-history
- **controller_controls_mine:** Dennis J  Thier et al → Portable Unit #1; 2009-05-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dennis J  Thier et al → Glendenning Limestone & Redi-Mix Co Inc; 2009-05-06 to current/open; source msha-controller-operator-history