In ancient times, how to advertise without a display?

In ancient times, there were no newspapers, televisions, no mobile phones, no internet, no outdoor LED display, so how did the ancients advertise?

PZT Piezoelectric Rings

Yuhai company develop and produce of various rings sizes, bearing variety of electrode and metallisation configurations. This variety of Rings is fabricated from various material formulations for applications such as high power, sensitivity, stability.

Features

· • electrode type on request

· • Surface roughness on request, for specific demanding application

· • Thickness/Radial frequency tuning available on request

• Wide choice of PZT formulations

Applications include

• Sensors

• Welding

• Ultrasonic cleaning

• Precise Measurement

• Ultrasonic scalpel

• Cauterisation

• Phacoemulsification

• Therapeutic ultrasound

• Accelerometers

Dimension range

Outer diameter	3-180mm
Inner diameter	1-150mm
Thickness	0.2-25mm

Piezo Ring,Pzt Ring,Piezoelectric Ceramic Ring,Piezo Ceramic Ring

Zibo Yuhai Electronic Ceramic Co., Ltd. , https://www.yhpiezo.com