# Relationship history for MSHA mine 3600074

Current hierarchy: **CRH PLC → Pennsy Supply Inc → Landisville Quarry**

- 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:** J Miller Eshleman & Son Inc → Landisville Quarry; 1950-01-01 to 1993-06-30; source msha-controller-operator-history
- **controller_controls_mine:** James  Eshleman → Landisville Quarry; 1950-01-01 to 1997-09-30; source msha-controller-operator-history
- **controller_controls_operator:** James  Eshleman → J Miller Eshleman & Son Inc; 1950-01-01 to 1993-06-30; source msha-controller-operator-history
- **operator_operates_mine:** J Miller Eshleman & Son Inc → Landisville Quarry; 1993-07-01 to 1997-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Barry R  Strohm → Landisville Quarry; 1993-07-01 to 1997-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Barry R  Strohm → J Miller Eshleman & Son Inc; 1993-07-01 to 1997-04-30; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Landisville Quarry; 1993-07-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** J Miller Eshleman & Son Inc → Landisville Quarry; 1997-05-01 to 1997-09-30; source msha-controller-operator-history
- **controller_controls_operator:** James  Eshleman → J Miller Eshleman & Son Inc; 1997-05-01 to 1997-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Prospect Aggregates Inc → Landisville Quarry; 1997-10-01 to 2007-09-17; source msha-controller-operator-history
- **controller_controls_mine:** Donald C Emich → Landisville Quarry; 1997-10-01 to 2004-11-30; source msha-controller-operator-history
- **controller_controls_operator:** Donald C Emich → Prospect Aggregates Inc; 1997-10-01 to 2004-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Jeff  Sweigart → Landisville Quarry; 2004-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeff  Sweigart → Prospect Aggregates Inc; 2004-12-01 to 2007-09-17; source msha-controller-operator-history
- **operator_operates_mine:** Pennsy Supply Inc → Landisville Quarry; 2007-09-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Pennsy Supply Inc; 2007-09-18 to current/open; source msha-controller-operator-history