 The 1970s for PCB Piezotronics saw expansion of its standard product offerings, to include other types of sensor technologies.In 1971, the company developed a 100,000 g high-shock, ICP® quartz accelerometer; Impulse Hammers for structural excitation were developed in 1972; and in 1973, the first rugged, industrial-grade ICP® accelerometer was introduced to serve the emerging machinery health monitoring market.Employment grew to 25 employees.