# Relationship history for MSHA mine 4700053

Current hierarchy: **Fred Weber, Inc. → Iron Mountain Trap Rock Company → Rock Springs 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

- **controller_controls_mine:** Martin Marietta Materials Inc → Rock Springs Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James W  Weaver et al → Rock Springs Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Foley Brothers Inc → Rock Springs Quarry; 1950-01-01 to 1983-03-24; source msha-controller-operator-history
- **controller_controls_mine:** G C  Lindquist → Rock Springs Quarry; 1950-01-01 to 1983-03-24; source msha-controller-operator-history
- **controller_controls_operator:** G C  Lindquist → Foley Brothers Inc; 1950-01-01 to 1983-03-24; source msha-controller-operator-history
- **operator_operates_mine:** Weaver Construction Company → Rock Springs Quarry; 1983-03-25 to 1986-03-31; source msha-controller-operator-history
- **controller_controls_operator:** James W  Weaver et al → Weaver Construction Company; 1983-03-25 to 1986-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Aggregates → Rock Springs Quarry; 1986-04-01 to 2002-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Aggregates; 1986-04-01 to 2002-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Fred Weber, Inc. → Rock Springs Quarry; 1997-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Materials Inc. → Rock Springs Quarry; 2002-04-01 to 2009-04-22; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Materials Inc.; 2002-04-01 to 2009-04-22; source msha-controller-operator-history
- **operator_operates_mine:** Iron Mountain Trap Rock Company → Rock Springs Quarry; 2009-04-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fred Weber, Inc. → Iron Mountain Trap Rock Company; 2009-04-23 to current/open; source msha-controller-operator-history