# Relationship history for MSHA mine 0401929

Current hierarchy: **John A Weimer → Weimer and Sons → Pacific Heights Pit**

- 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

- **controller_controls_mine:** Granite Construction Inc → Pacific Heights Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Robinson Construction Company Inc → Pacific Heights Pit; 1950-01-01 to 2002-08-21; source msha-controller-operator-history
- **controller_controls_mine:** Dennis  Robinson → Pacific Heights Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dennis  Robinson → Robinson Construction Company Inc; 1950-01-01 to 2002-08-21; source msha-controller-operator-history
- **controller_controls_mine:** John H  Franklin → Pacific Heights Pit; 1990-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Granite Construction Company → Pacific Heights Pit; 2002-08-22 to 2014-05-12; source msha-controller-operator-history
- **controller_controls_operator:** Granite Construction Inc → Granite Construction Company; 2002-08-22 to 2014-05-12; source msha-controller-operator-history
- **operator_operates_mine:** Franklin Construction, Inc. → Pacific Heights Pit; 2014-05-13 to 2020-01-15; source msha-controller-operator-history
- **controller_controls_operator:** John H  Franklin → Franklin Construction, Inc.; 2014-05-13 to 2020-01-15; source msha-controller-operator-history
- **operator_operates_mine:** Weimer and Sons → Pacific Heights Pit; 2020-01-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John A Weimer → Pacific Heights Pit; 2020-01-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John A Weimer → Weimer and Sons; 2020-01-16 to current/open; source msha-controller-operator-history