Last November, our industry celebrated the 75th anniversary of the announcement by Bell Telephone Labs (BTL) of the transistor’s birth. I knew that many facets of the transistor’s invention would be well covered so I didn’t plan to add an article to this pile because I didn’t feel I had much to improve upon what would be written. However, I did read several of these articles including the excellent article titled “The Surface State Job,” written by my friend David Laws – writer, photographer, and Semiconductor Curator at the Computer History Museum. What I read made me ask one simple question. At least, I thought it was a question with a simple answer.
BTL held its first transistor symposium over five days in September 1951. According to the Bell Telephone Record, an internal Bell publication, 300 people attended this first transistor symposium, which included representatives from Bell, the US military, and US military contractors. The material presented in this first symposium covered basic transistor physics and theory and a discussion of the characteristics of point-contact transistors (in production) and grown-junction transistors (experimental but coming soon). This event was restricted to US citizens and to people specifically cleared by the military services.
In April 1952, BTL held a second transistor symposium where it explained how to make transistors to the original licensees of the BTL transistor patents. This event, perhaps more than any other, marks the original start of the commercial semiconductor industry. The usual history credits the invention of the transistor at BTL, followed by the founding of Shockley Transistor Labs, the exit of eight key employees from Shockley to found Fairchild Semiconductor, and then the Fairchildren – companies that sprang from the nourishing inventiveness at Fairchild. However, I realized that this well-trod history is really the second phase of the semiconductor revolution. The relatively unknown first phase was triggered by BTL’s 1952 Transistor Symposium.
My simple question was this: Which companies attended BTL’s second transistor symposium?
You might think that the companies attending such an important event in electronics history would be well documented. They aren’t. Answering this question has taken considerable research resulting in a six-article series, and I’m only 95% confident that I have the right list.
As a first attempt to answer this question, I asked David Laws if he had the list of attending companies. Laws is an accomplished historian when it comes to the history of the electronics industry. The last time Laws triggered one of my questions, I spent quite a while figuring out which devices Gordon Moore used to create the famous exponential growth curve in his 1965 article in Electronics titled “Cramming more components onto integrated circuits.” The data on this curve originally defined Moore’s Law. I started with a drawing containing some cryptic notes about the semiconductor die shown in a photo that Laws had described in an article. (See “Moore’s Law and the Seven Devices.”)
David Laws quickly replied to my latest query:
“I don’t have any useful data regarding Bell transistor licensees. Most knowledgeable in this area is Michael Riordan, co-author of Crystal Fire.”
Riordan is a physicist and a giant when it comes to the history of physics and technology. Besides Crystal Fire: The Invention of the Transistor and the Birth of the Information Age, he’s written or co-written Tunnel Visions: The Rise and Fall of the Superconducting Super Collider, The Rise of the Standard Model: Particle Physics in the 1960s and 1970s, The Shadows of Creation: Dark Matter and the Structure of the Universe, and The Hunting of the Quark: A True Story of Modern Physics.
Laws copied Riordan on his email reply to me, and Riordan replied in short order:
“I’ve sent essentially all of my files and records on the transistor/Crystal Fire to the AIP Niels Bohr Library for safe and long-lasting keeping, so I cannot be of much help here.”
So now, I was on my own. I turned to my trusty research assistant, Google, for help. I asked Google for a list of the attending companies at the second BTL transistor symposium in 1952 and got all sorts of answers – except they weren’t the answers I wanted. Most specifically, I found references that stated that 20, 24, 25, 26, 30, 34, 35, or 40 companies attended that second symposium. Clearly, there was not much consensus on the attendee list.
Finally, I decided that the book published by BTL itself, A History of Engineering and Science in the Bell System: Electronics Technology (1925-1975), was likely to have the definitive number. That book states:
“Twenty-six domestic and fourteen foreign licensees, many of these newly signed, attended the symposium, which convened at Murray Hill for six days and at the Western Electric-Bell Laboratories location in Allentown for two final days, where the point-contact transistor had been introduced into Western Electric manufacture in October 1951.”
So, my number was forty companies – 26 companies in the US and 14 companies elsewhere. Now all I had to do was figure out which companies. I found a “Rump Session” presentation by R.M. Wallace from the 50th IEEE Semiconductor Interface Specialists Conference in 2019 that contained a list of companies that attended the 1952 transistor symposium. Wallace had extracted the list from Bo Lojek’s definitive book, History of Semiconductor Engineering. I confirmed that list using queries to Google Books, which has absorbed a copy of Lojek’s book. However, Lojek listed only 34 companies in attendance at the 1952 Transistor Symposium:
- Arnold Engineering
- Automatic Electric
- Automatic Telephone and Electric Company
- The Baldwin Company
- British Thompson-Houston Company
- Bulova Watch Company
- Crane Company
- England Electric Company
- Felten & Guilleaume Carlswerk
- General Electric Company (US)
- Hanovia Chemical and Manufacturing Company
- Hughes Tool Company (Hughes Aircraft)
- IBM Corp
- IT&T Corp
- Lenkurt Electric Company
- LM Ericsson
- T.R. Mallory
- Microwaves Associates
- Minneapolis Honeywell
- National Cash Register Company
- National Fabricated Fabrics
- NV Philips
- Radio Development and Research Corp
- Radio Reception Company
- Raytheon Manufacturing
- Siemens and Halske
- Sprague Electric Company
- Telefunken Gesellschaft
- Texas Instruments
- Transistor Products
- Tung-Sol Electric
A few of the companies on this list are familiar semiconductor vendors that continue to manufacture devices including transistors, diodes, and ICs. Other names on this list are companies that exited the semiconductor business, sold off their semiconductor operations, merged with other companies, or went out of business entirely.
In part 2 of this article series, I’ll be discussing the names on this list that clearly are not and never were semiconductor manufacturers. Parts 3 and 4 of this article series will then discuss the early transistor makers in the US and some of the early transistors they produced. Part 5 will then discuss the early transistor makers in Europe. Part 6 discusses early transistor makers in Japan, none of which appear on this list. By then, we should have fairly well exhausted the subject.
History of Semiconductor Engineering, Bo Lojek