Mainspring Companies, LLC provides in-house Administrative, Payroll, Human Resources, A/P, A/R, Accounting and Executive Mana ... gement services for a portfolio of privately owned businesses. Our areas of management expertise include industries such as Construction, Automation, E-Commerce, Material Handling and Real Estate Development among others. MODUS - National Facilities Services Company MBD Automation - Conveyors, Automated Equipment, VRC's Pivotal - Commercial Building Contractor & Maintenance Genlease - General Leasing Company McLindon Development Group - Real Estate Development Propel Production Studio - Video & Multi-Media Company read more