since 1922

History of its TechnicalFounding - 1960s

1970s

VehicleCommunication
Equipment
Business 1957〜

The rod antenna for transistor
radios, hit products at that time,
was what propelled Yokowo
Manufacturing Co., Ltd. to theforefront. Yokowoʼs high-quality
antennas with their smooth
extendibility based upon precisionpipe processing technologies
garnered recognition fromelectronics manufacturers. In thisway, antenna technologies becamea core business for the Company.

Car Antenna(Pillar Type）

Rod Antenna

100years

Evolution and Business/Product Development
1980s

AM/FMMotor Antenna

Extension
Cable A’ssy

Motor Operated Conner Pole

Microwave Components
1983〜

Low Noise Block Down Converter

Outdoor Unit
for BS

1956〜2003

PersonalCommunication
Antenna

Rod AntennaSporting Goods
1959〜1995

Golf clubs andshafts

Metal Bats
for Softball

In the midst of the leisure boom
during the period of high economic
growth, Yokowo took advantage
of our pipe technologies to begin
manufacturing and selling golf
clubs and shafts. The Company has
also expanded into metal bats andshafts for rackets.

Metal Bats

Microwave Technology
PipeDrawing
Technology
Spring Bar,FounderʼsInvention

Antenna Technology

Golf Shafts Promate

Micro Precision Processing TechnologyPrecision
Pipe
Processing
Technology

Spring bar craftsmanship transformed
into advanced, world-classtechnologies. These advanced, micro
precision processing technologies
bring unique, original products that
only Yokowo can provide, and theseare bearing fruit in diverse eldssuch as semiconductor inspection,connectors for electronic devices, andadvanced medical equipment.

As the founder of Yokowo Manufacturing Co., Ltd., the predecessor of YOKOWO CO.,LTD., Chutaro Yokoo (1894 to 1977) refined his skills as a craftsman producing precisionpipes used in pocket watch hinges. When wristwatches entered the mainstream, heinvented the spring bar. This is a belt-attachment component comprising a spring
inserted into an ultra-thin pipe, so it can expand at both ends. This landmark invention
became widely adopted overseas, capturing the worldʼs largest market share. This was
the starting point of “technical Yokowo” that exists to this day.

Everything Started with Pipes
After having finished his apprenticeship in 1922, Chutaro Yokoo decided to go out on
his own and start a business, opening the Seirinsha bicycle shop the next year. This wasdestroyed on the day of opening by the Great Kanto Earthquake, but reopened just one
month later.
In 1926, using the skills he had acquired over 15 years as a craftsman, he opened aprecision pipe processing factory in Mukojima, Tokyo.
Thus was born Yokowo Manufacturing Co., Ltd., the predecessor of YOKOWO CO., LTD.

05

Full-scale introduction ofmicrowave technologies at thelaunch of satellite broadcast
services. Since then, Yokowo has
deployed microwave equipment
for satellite broadcasting and VSAT,
and it is now an important coretechnology in the Companyʼs VCCS
and CTC business, with significant
contributions to supporting 5G
throughout its product line-up.

Yokowo 2023 Integrated Report

Circuit Testing
Connector Business
1979〜

Specications required for probes
and sockets for semiconductor
testing are becoming more
and more exacting, due to theminiaturization and increased
performance of semiconductors.
Yokowo started its circuit
testing connector businessin 1979, providing the world
with semiconductor testing jigs
developed using microwave
technology, in addition to its
world-class micro precision
processing technologies.

Contact Probe

InterfaceConnector

IC TestSocket

Fine Connector
Business 1986〜SPRING CONNECTOR™

Board to Board
Coaxial Connector

Yokowo 2023 Integrated Report06Until now, and from now on.
Using technology, Yokowo will continue to pioneer
1990s

the next generation.

2000sVehicle
Communication
Equipment BusinessGPSAntenna

Amplifier for
Glass Mounted
Automobile
Antenna

Diversity
Antenna for
Automobile TV

AM/FMMicro Antenna

Antenna forSDARS

Microwave Components
Transmitter
for VSAT

Tollgate Antenna
for ERP

Rod Antenna

Cellular AntennaSporting Goods

2010s
Laminated Antenna for Digital
Terrestrial Wave (Front Type)

Yokowo provides the worldʼs leading
automotive manufacturers withhigh-sensitivity, high-quality, and durable
vehicle antennas supporting wide
frequency bands. The world-leading microantennas developed by Yokowo havetransformed vehicle radio antennas frombeing mechanical to electrical components.

Multiband Internal Antenna
for Cellular Phone

Wire Coupled Antenna

Yokowo — towards a new 100 years

Combined Roof
Antenna (Hex Band)

Tollgate Antenna
for ETC

AM/FM
Shark Fin Antenna

2020sCombined Roof Shark Fin
Antenna (Cellular/GPS/SDARS)GNSSAntenna

These days, the communications
environment continues its
dramatic evolution, with 5G,IoT, etc. Yokowo will continue
to leverage its world-leading
technology and originality
to offer the unique antennas
demanded by society.

Tire Pressure
Monitoring System

Yokowoʼs LTCC business, based upon ceramics
technologies, has been in commercialization since
the early 2000s. In 2019, Yokowo established a joint
corporation as LTCC Materials Co., Ltd., achieving
an integrated production system from materials
development through to product manufacturing.

OpticalTransceiver

Ceramics &Electronic Devices
1996〜

Golf Shafts
Prelude ProIncubation
Center 2023〜

Patch Antenna
for GPS

Chip Antennafor Bluetooth

LTCC Interposer
Substrate12inch Interposer
Substrate

Ultra Thin
LTCC-CSP
Substrate for LED

Ultraminiature
LED Ring Lightof LTCC

4G/5G Antenna
Supporting 2×2
MIMO

Substrate forVehicle

Microwave Components
Antenna Technology
Special surface processing ofmaterials adds value to products,
including in terms of abrasion
resistance, heat resistance, adhesive
capabilities, and appearance. This is apromising technology that promotes
product differentiation and highfunctionality.

Micro Precision Processing Technology
Ceramic Technology

Surface Modication Material Technology
Circuit Testing Connector Business

LCD Panel
Test HeadBGA Test
SocketLow Profile
Contact ProbeHigh GigaSocket

Vertical Probe
Card

Micrograph of
Mechanics Parts

Penprobe

MEMS Probe
Card (YPX)High Giga Full
Shield Coax Socket

Fine Connector BusinessCoaxial Connector
for Antenna

Multi-Contact CoilConnector

2-Piece BladeConnector

Board to FPC/
Micro Wire Connector

Waterproof
I/O Connector
Lead Socket Connector

Optical Connector

Test Tools for
FPC/FFC, Connectors
1993〜

Clip Connector

Microwave Module
Test HeadMicrowave
Function Probe

Probe Connector /Giga Holder

Clip Connector for Boardto Board Connector

Board to Board Stamp

Medical Device
Business 2006〜
Micro Precision
Tip TerminalProcessing Devices for Catheter
for Medical(Radiopaque Marker)

07

Yokowo 2023 Integrated Report

Core Wire

Coil forGuidewire

Assembly of Atrial
Septal Needle

Inspection Tools
for InterfaceConnector

Waterproof 2-Piece
Blade Connector

Board to Board Connector
Test Tool for 5G Smartphones

Yokowo has been commercializing medical devices as its fourthpillar since 2006, taking advantage of its micro precision processingtechnology. In 2012, Yokowo acquired ISO 13485 (medical equipment
quality management system) certification, and through a startup
ecosystem in collaboration with academia, industry, and government,is aiming to provide innovative medical equipment.

Yokowo 2023 Integrated Report08