Arthur J. Holbrook

R( Rolf C. Hagen (Usa): 3 patents #1 of 3Top 35%

📍 Lynnfield, MA: #71 of 205 inventorsTop 35%

🗺 Massachusetts: #33,482 of 88,656 inventorsTop 40%

Overall (All Time): #1,682,948 of 4,157,543Top 45%

Patents All Time

Issued Patents All Time

Showing 1–3 of 3 patents

Patent #	Title	Co-Inventors	Date
D268360	Aquarium heater	—	1983-03-22
4333626	Aquarium heater	—	1982-06-08
4313048	Thermostatically controlled externally mounted electric aquarium heater	—	1982-01-26