# Relationship history for MSHA mine 1100491

Current hierarchy: **Michael A  Maedge → Mike A. Maedge Trucking Inc. → New Douglas**

- 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:** Richards Brick Company → New Douglas; 1950-01-01 to 2001-07-10; source msha-controller-operator-history
- **controller_controls_mine:** R W  Richards et al → New Douglas; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** R W  Richards et al → Richards Brick Company; 1950-01-01 to 2001-07-10; source msha-controller-operator-history
- **controller_controls_operator:** C Thomas  Richards et al → Richards Brick Company; 1950-01-01 to 2001-07-10; source msha-controller-operator-history
- **operator_operates_mine:** Mike A. Maedge Trucking Inc. → New Douglas; 2001-07-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael A  Maedge → New Douglas; 2001-07-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael A  Maedge → Mike A. Maedge Trucking Inc.; 2001-07-11 to current/open; source msha-controller-operator-history