# Relationship history for MSHA mine 3608905

Current hierarchy: **Joe E  Calamari → Joe Squid Inc → Shimer 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:** Ed Merritt → Shimer Quarry; 2001-02-15 to 2003-08-10; source msha-controller-operator-history
- **controller_controls_mine:** Ed  Merritt → Shimer Quarry; 2001-02-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ed  Merritt → Ed Merritt; 2001-02-15 to 2003-08-10; source msha-controller-operator-history
- **operator_operates_mine:** RPM 1 & 2 Stone Co. → Shimer Quarry; 2003-08-11 to 2005-07-28; source msha-controller-operator-history
- **controller_controls_mine:** Rodney P  Martin → Shimer Quarry; 2003-08-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rodney P  Martin → RPM 1 & 2 Stone Co.; 2003-08-11 to 2005-07-28; source msha-controller-operator-history
- **operator_operates_mine:** R and E Quarry → Shimer Quarry; 2005-07-29 to 2008-06-25; source msha-controller-operator-history
- **controller_controls_mine:** Enos E  Yoder et al → Shimer Quarry; 2005-07-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Enos E  Yoder et al → R and E Quarry; 2005-07-29 to 2008-06-25; source msha-controller-operator-history
- **controller_controls_operator:** Raymond  Mast et al → R and E Quarry; 2005-07-29 to 2008-06-25; source msha-controller-operator-history
- **operator_operates_mine:** Joe Squid Inc → Shimer Quarry; 2008-06-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Joe E  Calamari → Shimer Quarry; 2008-06-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joe E  Calamari → Joe Squid Inc; 2008-06-26 to current/open; source msha-controller-operator-history