When we innovate with purpose, everyone moves forward.
We believe progress should reach every community.
We started in a garage with one invention—Martcart™, the world’s first electric shopping cart—born from our founder Bill Sage’s desire to help his grandmother shop independently. From that start, Kiefer Sage—formerly known as Assembled Products Corporation-- has grown into a company that designs solutions and products with purpose—rooted in empathy, guided by innovation, and built to solve real problems.
Our purpose at Kiefer Sage is to grow leaders and grow businesses that make a difference. For customers, that means lasting value and solutions that make life safer and easier. For our team, it means growth and opportunity. For our communities, it means jobs, investment, and impact. Too often, overlooked markets are left with inadequate tools and limited opportunities. We’re here to change that.
Products and solutions with purpose.
Limited mobility solutions
Martcart™ provides solutions for limited mobility shoppers, delivering premier electric shopping carts for retail and commercial use. These mobility solutions help retailers attract loyal shoppers and support independence for people who need assistance navigating stores.
Commercial cleaning systems
Spraymaster™ manufactures electric-powered, plumbed-in commercial pressure washer systems for high-traffic facilities, delivering instant, powerful cleaning on demand to meet rigorous daily operational needs.
Vehicle mounting solutions
Jotto Desk® designs and manufactures vehicle solutions for first responders from bumper to bumper, including consoles, laptop mounts, cargo storage, and weapon retention—engineered for durability, easy installation, and seamless integration.
Co-assembly services
With 40+ years of experience building Martcart™, Spraymaster™, Jotto Desk® and more, Assembled Products partners with companies to design, assemble, ship, and scale their innovations with confidence.
Real change starts from within.
At Kiefer Sage, purpose drives us, and people define us—we grow leaders built for tomorrow’s challenges.
Forward-thinking from the start.
Innovation is in our DNA. From inventing the world’s first electric shopping cart to pioneering central pressure washing and mobile desks for law enforcement. Today, we’re building new solutions that shape the future of manufacturing and create lasting impact.
Our Company History
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