content_image/292680.jpg content_image/292679.jpg
Selling, General and Administrative Expenses. Selling, general and administrative expenses include the costs associated with sales and marketing, general corporate overhead, business development expenses, compensation expense, stock-based compensation expense, legal expenses, foreign currency transaction gains and losses and other related administrative functions. 

Engineering and Product Development Expenses. Engineering and product development expenses consist of new product development and testing, as well as application engineering related to customized products. 

Income Tax Provision. The Company’s overall effective income tax rate has historically been lower than the statutory rate primarily due to foreign income tax rate differentials, research and development credits and deductions related to domestic manufacturing activities. 

## Results of Operations 

The following table sets forth, for the periods indicated, certain consolidated statements of income data expressed as a percentage of revenues: 

<img src='content_image/292680.jpg'>

The following table sets forth, for the periods indicated, a breakdown of our products and service revenues: 

<img src='content_image/292679.jpg'>

