# Relationship history for MSHA mine 0502399

Current hierarchy: **Redland Plc → Mobile Premix Company → Half Pints Crusher**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** M P M Inc → Half Pints Crusher; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Siegrist Construction Company Et Al → Half Pints Crusher; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Valley View Excavation Company → Half Pints Crusher; 1950-01-01 to 1979-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Valley View Excavation Company → Half Pints Crusher; 1950-01-01 to 1979-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Valley View Excavation Company → Valley View Excavation Company; 1950-01-01 to 1979-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Burnett Construction Company → Half Pints Crusher; 1979-08-01 to 1982-10-14; source msha-controller-operator-history
- **controller_controls_operator:** Siegrist Construction Company Et Al → Burnett Construction Company; 1979-08-01 to 1982-10-14; source msha-controller-operator-history
- **operator_operates_mine:** Mobile Premix Company → Half Pints Crusher; 1982-10-15 to 1987-05-20; source msha-controller-operator-history
- **controller_controls_operator:** M P M Inc → Mobile Premix Company; 1982-10-15 to 1987-05-20; source msha-controller-operator-history
- **controller_controls_mine:** Koppers Co Inc & Redland Plc → Half Pints Crusher; 1987-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mobile Premix Company → Half Pints Crusher; 1987-05-21 to 1988-06-13; source msha-controller-operator-history
- **controller_controls_operator:** Koppers Co Inc & Redland Plc → Mobile Premix Company; 1987-05-21 to 1988-06-13; source msha-controller-operator-history
- **operator_operates_mine:** Mobile Premix Company → Half Pints Crusher; 1988-06-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Redland Plc → Half Pints Crusher; 1988-06-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Redland Plc → Mobile Premix Company; 1988-06-14 to current/open; source msha-controller-operator-history