# Relationship history for MSHA mine 3608633

Current hierarchy: **Blaine E  Forbes → Troy Sand & Gravel, Inc → Troy Sand & Gravel, 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Temple Sand & Gravel → Troy Sand & Gravel, Inc.; 1997-04-01 to 1999-11-08; source msha-controller-operator-history
- **controller_controls_mine:** Donald L  Temple → Troy Sand & Gravel, Inc.; 1997-04-01 to 1999-11-08; source msha-controller-operator-history
- **controller_controls_operator:** Donald L  Temple → Temple Sand & Gravel; 1997-04-01 to 1999-11-08; source msha-controller-operator-history
- **operator_operates_mine:** Troy Sand & Gravel, Inc → Troy Sand & Gravel, Inc.; 1999-11-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Troy  Adzima → Troy Sand & Gravel, Inc.; 1999-11-09 to 2002-05-01; source msha-controller-operator-history
- **controller_controls_operator:** Troy  Adzima → Troy Sand & Gravel, Inc; 1999-11-09 to 2002-05-01; source msha-controller-operator-history
- **controller_controls_mine:** Blaine E  Forbes et al → Troy Sand & Gravel, Inc.; 2002-05-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blaine E  Forbes et al → Troy Sand & Gravel, Inc; 2002-05-02 to current/open; source msha-controller-operator-history