# Relationship history for MSHA mine 1400453

Current hierarchy: **Robin Lee  Huber → Huber Sand Inc → Huber Sand Pit #4**

- 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:** Alsop Sand Company Inc → Huber Sand Pit #4; 1950-01-01 to 1980-05-05; source msha-controller-operator-history
- **controller_controls_mine:** David H  Barclay et al → Huber Sand Pit #4; 1950-01-01 to 2017-05-10; source msha-controller-operator-history
- **controller_controls_operator:** David H  Barclay et al → Alsop Sand Company Inc; 1950-01-01 to 1980-05-05; source msha-controller-operator-history
- **controller_controls_operator:** Dane Q  Barclay et al → Alsop Sand Company Inc; 1950-01-01 to 1980-05-05; source msha-controller-operator-history
- **operator_operates_mine:** Western Sand Company → Huber Sand Pit #4; 1980-05-06 to 1985-08-14; source msha-controller-operator-history
- **controller_controls_mine:** Greg  Newberry et al → Huber Sand Pit #4; 1980-05-06 to 1985-08-14; source msha-controller-operator-history
- **controller_controls_operator:** Greg  Newberry et al → Western Sand Company; 1980-05-06 to 1985-08-14; source msha-controller-operator-history
- **operator_operates_mine:** Huber Sand Inc → Huber Sand Pit #4; 1985-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robin  Huber  et al → Huber Sand Pit #4; 1985-08-15 to 2019-08-22; source msha-controller-operator-history
- **controller_controls_operator:** Robin  Huber  et al → Huber Sand Inc; 1985-08-15 to 2019-08-22; source msha-controller-operator-history
- **controller_controls_operator:** Louis  Huber  et al → Huber Sand Inc; 1985-08-15 to 2019-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Dane Q Barclay → Huber Sand Pit #4; 2017-05-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dane Q Barclay → Alsop Sand Company Inc; 2017-05-11 to 1980-05-05; source msha-controller-operator-history
- **controller_controls_mine:** Robin  Huber et al → Huber Sand Pit #4; 2019-08-23 to 2023-04-24; source msha-controller-operator-history
- **controller_controls_operator:** Robin  Huber et al → Huber Sand Inc; 2019-08-23 to 2023-04-24; source msha-controller-operator-history
- **controller_controls_operator:** Barbara  Huber et al → Huber Sand Inc; 2019-08-23 to 2023-04-24; source msha-controller-operator-history
- **controller_controls_mine:** Robin Lee  Huber → Huber Sand Pit #4; 2023-04-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robin Lee  Huber → Huber Sand Inc; 2023-04-25 to current/open; source msha-controller-operator-history