# Relationship history for MSHA mine 4503375

Current hierarchy: **Daniel T  Guimont; Michael T  Ritter → DTG Enterprises, Inc. → DTG Rock & Demolition Pits**

- 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:** Anderson Rock & Demolition Pits → DTG Rock & Demolition Pits; 1999-03-01 to 2019-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Las Incorporated  et al → DTG Rock & Demolition Pits; 1999-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Las Incorporated  et al → Anderson Rock & Demolition Pits; 1999-03-01 to 2019-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Ron E  Anderson  et al → Anderson Rock & Demolition Pits; 1999-03-01 to 2019-10-31; source msha-controller-operator-history
- **operator_operates_mine:** DTG Enterprises, Inc. → DTG Rock & Demolition Pits; 2019-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Daniel T  Guimont et al → DTG Rock & Demolition Pits; 2019-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel T  Guimont et al → DTG Enterprises, Inc.; 2019-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael T  Ritter et al → DTG Enterprises, Inc.; 2019-11-01 to current/open; source msha-controller-operator-history