In the late 1960s and early 1970s, Czechoslovakia, like many other countries, had its own pacemaker development/manufacturing.
Starting in 1965, Dr. Bohumil Peleška and ing. Vladimír Bičík designed and manufactured a VOO pacemaker under the auspices of the “Research Institute for Medical Electronics and Modelling” (RIMEM). The device underwent human implantation and worked for 2 years before being preemptively replaced.
RIMEM’s pacemakers were then transferred for commercial production at the Czechoslovak TESLA state-owned electrotechnical conglomerate. TESLA was originally named after Nikola Tesla, but later explained by the Communist regime as an abbreviation from TEchnika SLAboproudá, which means “low-voltage technology.”
An interesting presentation about the history of pacemakers in the former Czechoslovakia is available here.
I can’t remember exactly where I found the picture of a Pacesetter model BD102 VVI, but the story behind it is documented by Kirk Jeffrey in “Machines in our Hearts”:
In 1965, Australian medical device pioneer Noel Gray established Telectronics – Australia’s first manufacturing facility for producing pacemakers that were designed in-house. Telectronics was an innovative developer, achieving some major successes in the early cardiac pacing field, for example, Telectronics’ leads allowed narrowing the pacing pulse to its current nominal of 0.5 milliseconds; encapsulating the pacemaker in titanium instead of epoxy; using a microplasma weld to join the two halves of the pacemaker capsule; creating one of the first rate-responsive ‘demand’ pacemakers; and isolating the pacemaker’s battery in a separate compartment to deal with the problem of leaking mercury-zinc batteries. 
