A series of mini hydraulic excavators—the 303.5D CR, 304D CR, 305D CR, and 305.5D CR—are versatile, compact-radius machines designed to work comfortably in confined spaces. Model designations reflect operating weights (3 1/2 to 5 1/2 tons), enhanced stability, redesigned work-tool coupler, and engines that meet Tier 4 Interim regulations. The boom features a curve design for digging flexibility and fabricated-box construction for strength and durability. Caterpillar. 800-368-6029. www.cat.com