# Relationship history for MSHA mine 0102852

Current hierarchy: **Martin Marietta Materials Inc → Martin Marietta Materials, Inc. → Shorter Plant**

- 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:** Martin Marietta Materials Inc → Shorter Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ray P  Lambert Jr et al → Shorter Plant; 1986-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lambert Sand & Gravel Company Inc → Shorter Plant; 1990-02-01 to 1995-10-17; source msha-controller-operator-history
- **controller_controls_operator:** Ray P  Lambert Jr et al → Lambert Sand & Gravel Company Inc; 1990-02-01 to 1995-10-17; source msha-controller-operator-history
- **controller_controls_operator:** Harry E  Lambert et al → Lambert Sand & Gravel Company Inc; 1990-02-01 to 1995-10-17; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Aggregates → Shorter Plant; 1995-10-18 to 2002-09-08; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Aggregates; 1995-10-18 to 2002-09-08; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Materials, Inc. → Shorter Plant; 2002-09-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Materials, Inc.; 2002-09-09 to current/open; source msha-controller-operator-history