# Relationship history for MSHA mine 3700068

Current hierarchy: **Robert A Pezza; Michael T Pezza → Material Sand & Stone Corp. → MATERIAL SAND & STONE CORP**

- 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:** Material Service Inc → MATERIAL SAND & STONE CORP; 1950-01-01 to 1985-07-08; source msha-controller-operator-history
- **controller_controls_mine:** Fortune Harvey → MATERIAL SAND & STONE CORP; 1950-01-01 to 1985-07-08; source msha-controller-operator-history
- **controller_controls_operator:** Fortune Harvey → Material Service Inc; 1950-01-01 to 1985-07-08; source msha-controller-operator-history
- **operator_operates_mine:** Material Sand & Stone → MATERIAL SAND & STONE CORP; 1985-07-09 to 1994-09-22; source msha-controller-operator-history
- **controller_controls_mine:** Leonard  Pezza → MATERIAL SAND & STONE CORP; 1985-07-09 to 1994-09-22; source msha-controller-operator-history
- **controller_controls_operator:** Leonard  Pezza → Material Sand & Stone; 1985-07-09 to 1994-09-22; source msha-controller-operator-history
- **operator_operates_mine:** Material Sand & Stone Corp. → MATERIAL SAND & STONE CORP; 1994-09-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert  A  Pezza → MATERIAL SAND & STONE CORP; 1994-09-23 to 2016-05-23; source msha-controller-operator-history
- **controller_controls_operator:** Robert  A  Pezza → Material Sand & Stone Corp.; 1994-09-23 to 2016-05-23; source msha-controller-operator-history
- **controller_controls_mine:** Michael T Pezza → MATERIAL SAND & STONE CORP; 2016-05-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael T Pezza → Material Sand & Stone Corp.; 2016-05-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert A Pezza → Material Sand & Stone Corp.; 2016-05-24 to current/open; source msha-controller-operator-history