The North American Philips Company (Norelco) was located at 750 South Fulton Avenue in Mount Vernon, NY in 1958.

North American Philips GM Counter 1942

North American Philips Norelco Geiger Counter 1948

North American Philips Company Norelco Geiger Counter Ad 1944

The Norelco Model PW 4010 Radiation Detector was offered in 1954. It was a small, lightweight unit. It had a novel battery saving circuit. The novel feature is that the high voltage for the counter is only generated when a count is taking place. This reduces demand on the battery. It had a halogen-quenched Geiger tube. The unit had a relatively thick case and thus was only sensitive to high energy betas and gammas. It used two special 30 volt batteries and one 1.5 volt penlight battery. Two positions on the meter indicated plate and filament battery condition. It came with a single earphone. The unit was 5-5/8” x 1-5/8” x 4-1/8” and weighed 1 lb. 9-3/4 oz.

Norelco Model PW 4010 1954

The Model PW-4012 was offered in 1958. It was rugged, watertight and tropicalized for measuring x-ray and gamma contamination. Three ranges were available from 1, 10, and 100 mR/h. There was also a provision to insert a probe extension. It can also use beta sensitive GM tubes.

Philips Model PW-4012 1958

Philips Nuclear Equipment offered the transistorized pocket radiation monitor PW-4014 in 1958. It was advertised for use in “Nuclear Physics and Atomic Energy”. It has low measuring range 0-3 mR/h for radium-gammas, can connect separate GM probes and earphone, low power consumption, printed wiring, and tropic and waterproof. It employs the Philips GM type 18503.

Philips Model PW-4014 1958