# Relationship history for MSHA mine 0201060

Current hierarchy: **Stewart  Kessen → Bradshaw Mountain Redi-Mix Ii → Bradshaw Mountain Redi-Mix Ii**

- 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:** Humboldt Sand & Rock Inc → Bradshaw Mountain Redi-Mix Ii; 1950-01-01 to 1983-03-29; source msha-controller-operator-history
- **controller_controls_mine:** Tiffany Albert M Sr → Bradshaw Mountain Redi-Mix Ii; 1950-01-01 to 1983-03-29; source msha-controller-operator-history
- **controller_controls_operator:** Tiffany Albert M Sr → Humboldt Sand & Rock Inc; 1950-01-01 to 1983-03-29; source msha-controller-operator-history
- **operator_operates_mine:** Consolidated Rock & Materials Inc → Bradshaw Mountain Redi-Mix Ii; 1983-03-30 to 1986-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Duncan Don → Bradshaw Mountain Redi-Mix Ii; 1983-03-30 to 1986-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Duncan Don → Consolidated Rock & Materials Inc; 1983-03-30 to 1986-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Bradshaw Mt Sand & Rock → Bradshaw Mountain Redi-Mix Ii; 1986-08-01 to 1987-10-28; source msha-controller-operator-history
- **controller_controls_mine:** Maes Richard → Bradshaw Mountain Redi-Mix Ii; 1986-08-01 to 1987-10-28; source msha-controller-operator-history
- **controller_controls_operator:** Maes Richard → Bradshaw Mt Sand & Rock; 1986-08-01 to 1987-10-28; source msha-controller-operator-history
- **operator_operates_mine:** Bradshaw Mountain Redi-Mix Ii → Bradshaw Mountain Redi-Mix Ii; 1987-10-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stewart  Kessen → Bradshaw Mountain Redi-Mix Ii; 1987-10-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stewart  Kessen → Bradshaw Mountain Redi-Mix Ii; 1987-10-29 to current/open; source msha-controller-operator-history