The Reproductive System (Gollancz SF Library) - Tapa blanda

Wompler's Walking Babies once put Millford, Utah, on the map. But they aren't selling like they used to. In fact, they aren't selling at all and the only alternative to winding the company up is to tap the government for a research grant. And so Wompler Research Laboratories and Project 32 come into being. The plan is tp produce self-replicating mechanisms; identical cells equipped to repair intracellular breakdowns, convert power from their environment and create new cells. But suddenly the nondescript grey metal boxes start crawling about the laboratory, feeding voraciously on any metal... and multiplying at an alarming rate.

John Sladek (1937 - 2000)
John Sladek was born in Iowa in 1937 but moved to the UK in 1966, where he became involved with the British New Wave movement, centred on Michael Moorcock's groundbreaking New Worlds magazine. Sladek began writing SF with 'The Happy Breed', which appeared in Harlan Ellison's seminal anthology Dangerous Visions in 1967, and is now recognized as one of SF's most brilliant satirists. His novels and short story collections include The Muller Fokker Effect, Roderick and Tik Tok, for which he won a BSFA Award. He returned to the United States in 1986, and died there in March 2000.