Is this a real patent?

Yes — the original drawing as filed at the U.S. Patent Office, cleaned and printed. Public domain by law.

An unframed print on 200 g/m² matte paper, printed in Europe. Dispatched in 2–4 working days, followed by transit. Shipping is included to Spain, Portugal, France, Germany, Italy, Netherlands, Belgium, Austria and Ireland. Tracking by email.

What if it arrives damaged?

Send a photo within 7 days and we reprint and reship it free.

PD-38 · US 879,532

Space telegraphy

Original patent print · 1908

De Forest's audion triode, 1908 — the first electronic amplifier, grandfather of every radio and computer tube.

200 g/m² matte paper · Unframed

29 € · Shipping included · Choose size ↓

Space telegraphy patent drawing, 1908, archive paper finish

US 879,532Space telegraphy1908

Inventor: Lee De Forest
Patented: February 18, 1908

Finish

Size

Total29 €

Shipping included

Dispatch in 2–4 working days
14-day returns
Secure payment via Stripe

Shipping to Spain, Portugal, France, Germany, Italy, Netherlands, Belgium, Austria and Ireland. Delivery time includes transit after dispatch.

PD-38 · US 879,532 · Filed January 29, 1907 ·

Pairs well with

Full collection

Common questions

Is this a real patent?: Yes — the original drawing as filed at the U.S. Patent Office, cleaned and printed. Public domain by law.
How is it shipped?: An unframed print on 200 g/m² matte paper, printed in Europe. Dispatched in 2–4 working days, followed by transit. Shipping is included to Spain, Portugal, France, Germany, Italy, Netherlands, Belgium, Austria and Ireland. Tracking by email.
What if it arrives damaged?: Send a photo within 7 days and we reprint and reship it free.

Read the full FAQ

Space telegraphy

Pairs well with

Electro-Magnetic Telegraph

Improvement in Telegraphy

transmitting electrical signals

Common questions